Publications

2024

• Kallyan Das, Robert Elschner, Stefan Weide, Colja Schubert, Robert Mahn, Klaus Oestereich, Thomas Marynowski, Gunter Wiedemann, Frank Heine
  Demonstration of an Intradyne BPSK Communication System with a GEO Space Ground Link to the T-AOGS,
  2023 IEEE International Conference on Space Optical Systems and Applications (ICSOS), IEEE-ICSOS 2023, April 2024, doi: 10.1109/ICSOS59710.2023.10490275, arXiv: https://ieeexplore.ieee.org/abstract/document/10490275, Open Access

2023

• Isaac Sackey, Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Tokuharu Kimura, Yu Tanaka, Tsuyoshi Yamamoto, Gregor Ronniger, Robert Elschner, Carsten Schmidt-Langhorst, Takeshi Hoshida
  Design and Characterization of Dispersion-Tailored Silicon Strip Waveguide toward Wideband Wavelength Conversion,
  Institute of Electronics, Information and Communication Engineers (IEICE), vol. Institute of Electronics, Information and Communication Engineers (IEICE), November 2023, doi: https://search.ieice.org/offprint/opdl.php?opk=efghikmpuvxz12379ABCEHIJLMNOXZ, Open Access
• Robert Emmerich, Carsten Schmidt-Langhorst, Colja Schubert, Ronald Freund
  Characterization of C-Band Coherent Receiver Front-ends for Transmission Systems beyond S-C-L-Band,
  IEEE Photonics Technology Letters , IEEE, vol. 35, pp. 1231 - 1234, September 2023, doi: 10.1109/LPT.2023.3312697, Open Access, Invited Paper
• Ruben S. Luis, Georg Rademacher, Benjamin J. Puttnam, Giammarco Di Sciullo, Andrea Marotta, Robert Emmerich, Nicolas Braig-Christophersen, Ralf Stolte, Fabio Graziosi, A. Mecozzi, Colja Schubert, Giuseppe Ferri, F. Achten, Pierre Sillard, Roland Ryf, Lauren Dallachiesa, Satoshi Shinada, Cristian Antonelli, Hideaki Furukawa
  Demonstration of a 15-Mode Network Node Supported by a Field-Deployed 15-Mode Fiber,
  Journal of Lightwave Technology, IEEE, vol. 41, pp. 3695 - 3703, May 2023, doi: 10.1109/JLT.2023.3276312, arXiv: https://ieeexplore.ieee.org/document/10124347, Invited Paper
• Gregor Ronniger, Isaac Sackey, Carsten Schmidt-Langhorst, Robert Elschner, Md Mahasin Khan, Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Tsuyoshi Yamamoto, Yu Tanaka, Takeshi Hoshida, Colja Schubert, Ronald Freund
  Optimization and Performance Evaluation of Single-mode SOI Waveguides for Ultra-broadband C-to-S Wavelength Conversion,
  Journal of Lightwave Technology, April 2023, doi: 10.1109/JLT.2023.3268826, Open Access
• Vegenshanti Valerian Dsilva, Isaac Sackey, Gregor Ronniger, Guillermo von Hünefeld, Binoy Chacko, Colja Schubert, Ronald Freund
  Performance Assessment of Joint Optical-Digital Nonlinearity Mitigation Schemes in Long-Haul Systems,
  IEEE Photonics Technology Letters, pp. 649-652, March 2023, doi: 10.1109/LPT.2023.3268735, Open Access

2022

• Matheus Ribeiro Sena, Pratim Hazarika, Caio Marciano Santos, Bruno Correia, Robert Emmerich, Mohammad Behnam Shariati, Antonio Napoli, Vittorio Curri, Wladek Forysiak, Colja Schubert, Johannes Fischer, Ronald Freund
  Advanced DSP-based Monitoring for Spatially resolved and Wavelength-dependent Amplifier Gain Estimation and Fault Location in C+L-band Systems,
  Journal of Lightwave Technology, IEEE, ISSN: 1558-2213, pp. 1-10, September 2022, doi: 10.1109/JLT.2022.3208209, arXiv: https://ieeexplore.ieee.org/document/9896153, Open Access
• Gabriele Di Rosa, Robert Emmerich, Matheus Ribeiro Sena, Johannes Fischer, Colja Schubert, Ronald Freund, Andre Richter
  Characterization, Monitoring, and Mitigation of Standard C-Band Transceivers I/Q Imbalance in Multiband Systems,
  Journal of Lightwave Technology, IEEE, ISSN: 1558-2213, February 2022, doi: 10.1109/JLT.2022.3154888, arXiv: https://ieeexplore.ieee.org/document/9723008, Open Access

2021

• Robert Emmerich, Matheus Ribeiro Sena, Robert Elschner, Carsten Schmidt-Langhorst, Isaac Sackey, Colja Schubert, Ronald Freund
  Enabling S-C-L-Band Systems with Standard C-Band Modulator and Coherent Receiver using Coherent System Identification and Nonlinear Predistortion,
  Journal of Lightwave Technology, IEEE, ISSN: 1558-2213, October 2021, doi: 10.1109/JLT.2021.3123430, arXiv: https://ieeexplore.ieee.org/document/9591326, Open Access, Invited Paper

2020

• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert, Ronald Freund
  Experimental Demonstrations of High-Capacity THz-Wireless Transmission Systems for Beyond 5G,
  IEEE Communications Magazine, 2020, doi: https://doi.org/10.1109/MCOM.001.2000306

2019

• Shigeki Watanabe, Tomoyuki Kato, Takahito Tanimura, Carsten Schmidt-Langhorst, Robert Elschner, Isaac Sackey, Colja Schubert, Takeshi Hoshida
  Wavelength conversion using fiber cross-phase modulation driven by two pump waves ,
  Optics Express, vol. 27, no. 12, pp. 16767-16780, May 2019, doi: 10.1364/OE.27.016767, Open Access
• Isaac Sackey, Carsten Schmidt-Langhorst, Robert Emmerich, Robert Elschner, Tomoyuki Kato, Takahito Tanimura, Shigeki Watanabe, Takeshi Hoshida, Colja Schubert
  400-Gb/s Single-Photodiode Polarization-Agnostic Kramers-Kronig Reception of Distributedly-Aggregated Superchannel,
  Journal of Lightwave Technology , vol. 37, pp. 156-162, January 2019, doi: 10.1109/JLT.2018.2885173, Invited Paper

2018

• Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou, Thomas Merkle, Colja Schubert, Robert Elschner, Alexandros Katsiotis, Panagiotis Stavrianos, Dimitrios Kritharidis, Panteleimon-Konstantinos Chartsias, Joonas Kokkoniemi, Markku Juntti, Janne Lehtomaki, Antonio Teixeira, Francisco Rodrigues
  Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G,
  IEEE Communications Magazine, IEEE, ISSN: 1558-1896, vol. 56, no. 6, pp. 144-151, June 2018, doi: 10.1109/MCOM.2018.1700890
• Isaac Sackey, Carsten Schmidt-Langhorst, Robert Elschner, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe, T. Hoshida, Colja Schubert
  Waveband-Shift Free Optical Phase Conjugator For Spectrally Efficient Fiber Nonlinearity Mitigation,
  JLT invited (ECOC2017 highly scored paper), January 2018, doi: 10.1109/JLT.2018.2790799, Invited Paper

2017

• Jasper Rödiger, Nicolas Perlot, R. Mottola, Robert Elschner, Carl-M. Weinert, O. Benson, Ronald Freund
  Numerical Assessment and Optimization of Discrete-Variable Time-Frequency Quantum Key Distribution,
  Physical Review A, vol. 95, no. 5, May 2017, doi: 10.1103/PhysRevA.95.052312
• Tomoyuki Kato, Shigeki Watanabe, T. Tanimura, Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, T. Hoshida
  THz-Range Optical Frequency Shifter for Dual Polarization WDM Signals Using Frequency Conversion in Fibre,
  Journal of Lightwave Technology, IEEE, ISSN: 0733-8724 , vol. 35, no. 6, pp. 1267 - 1273, January 2017, doi: 10.1109/JLT.2017.2649566, Invited Paper

2016

• T. Kato, T. Tanimura, T. Hoshida, Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, S. Watanabe
  Coherent-optical In-line Add/Drop of PDM Tributaries of Subcarrier Multiplexed Signals,
  IEEE PHOTONICS TECHNOLOGY LETTERS, ISSN: 1041-1135, vol. 28, no. 13, pp. 1465-1468, July 2016, doi: 10.1109/LPT.2016.2552243
• Robert Elschner, Thomas Richter, Carsten Schmidt-Langhorst, T. Kato, T. Tanimura, S. Watanabe, Colja Schubert
  Distributed aggregation of spectrally efficient single- and dual-polarization super-channels by optical frequency conversion in fiber,
  Journal of Lightwave Technology, vol. 34, no. 2, pp. 618-625, February 2016, Invited Paper

2015

• T. Roethlingshoefer, Thomas Richter, G. Onishchukov, Colja Schubert, B. Schmauss, G. Leuchs
  All-optical phase-preserving multilevel amplitude regeneration,
  Optics Express, vol. 22, no. 22, pp. 27077-27085, November 2015
• Gianluca Meloni, Marc Bohn, Huug de Waardt, Antonio D´Errico, Francesco Fresi, Antonio Napoli, Markus Nölle, Luca Poti, Danish Rafique, Talha Rahman, Nicola Sambo
  Experimental Comparison of Transmission Performance for Nyquist WDM and Time Frequency Time-Frequency Packing,
  Journal of Lightwave Technology, IEEE, vol. 33, no. 24, pp. 5261-5268, November 2015, doi: 10.1109/JLT.2015.2500608
• Sophie Lange, Marko Gruner, Christian Meuer, Martin Schell, Norman Wolf, Lei Yan
  Low Switching Voltage Mach-Zehnder Modulators Monolithically Integrated with DFB Laser for Data Transmission up to 107.4 Gb/s,
  Journal of Lightwave Technology, IEEE, vol. 34, no. 2, pp. 401 - 406, October 2015, doi: 10.1109/JLT.2015.2496426
• M. Leifgen, Robert Elschner, Nicolas Perlot, Carl-M. Weinert, Colja Schubert, O. Benson
  Practical Implementation and Evaluation of a Quantum Key Distribution Scheme Based on the Time-Frequency Uncertainty,
  Physical Review A - October 2015, vol. 92, no. 4, October 2015
• Anissa Zeghuzi, Dieter Bimberg, C.-A. Bunge, Christian Meuer, Holger Schmeckebier, Colja Schubert, Mirko Stubenrauch
  25 Gbit/s DPSK-Signal Generation using Directly Modulated Quantum-Dot SOAs,
  Applied Physics Letters 106, 213501, vol. 106, no. 21, May 2015, doi: 10.1063/1.4921785
• Johannes Fischer, Carsten Schmidt-Langhorst, Saleem Alreesh, Robert Elschner, Felix Frey, Pablo Wilke Berenguer, Lutz Molle, Markus Nölle, Colja Schubert
  Generation,Transmission and Detection of 4D Set-Partitioning QAM Signals,
  Journal of Lightwave Technology, vol. 33, no. 7, pp. 1445-1454, April 2015
• Zhixin Liu, Yong Chen, Zhihong Li, Brian Kelly, Richard Phelan, John O´Carroll, John P. Wooler, Natalie V. Wheeler, Alex-M. Heidt, Thomas Richter, Colja Schubert, Martin Becker, Francesco Poletti, Marco N. Petrovich, Shaif-ul Alam, David J. Richardson, Radan Slavík
  High-capacity directly modulated optical transmitter for 2-µm spectral region,
  Journal of Lightwave Technology (Special Issue), vol. 33, no. 7, pp. 1373-1379, April 2015, Invited Paper
• Stefan Meister, Hanjo Rhee, A. Al-Saadi, Bülent A. Franke, Sebastian Kupijai, Christoph Theiss, Hans J. Eichler, David Stolarek, H.H. Richter, Lars Zimmermann, Bernd Tillack, Mateusz Lesny, Christian Meuer, Colja Schubert, Ulrike Woggon
  High-Speed Fabry–Pérot Optical Modulator in Silicon With 3-μm Diode,
  Journal of Lightwave Technology, vol. 33, no. 4, February 2015
• Thomas Richter, Carsten Schmidt-Langhorst, Robert Elschner, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe, Colja Schubert
  Coherent subcarrier processing node based on fiber-frequency-conversion and free-running lasers,
  Journal of Lightwave Technology, vol. 33, no. 3, pp. 685-693, February 2015
• Antonio Napoli, Marc Bohn, Danish Rafique, Alexandros Stavdas, Nicola SAMBO, Luca Poti, Markus Nölle, Johannes Fischer, Emilio Riccardi, Annachiara Pagano, Andrea Di Giglio, Juan-P.-F.-P. Gimenez, Michela SVALUTO MOREOLO, Josep-M. Fàbrega, Emilio Hugues-Salas, Georgios Zervas, Dimitra Simeonidou, Patricia Layec, Antonio D´Errico, Talha Rahman
  Next Generation Elastic Optical Networks: the Vision of the European Research Project IDEALIST,
  IEEE Communications Magazine, vol. 53, no. 2, pp. 163-171, February 2015
• Nicola Sambo, Piero Castoldi, Antonio D´Errico, Emilio Riccardi, Annachiara Pagano, Michela Svaluto Moreolo, Josep-M. Fàbrega, Danish Rafique, Antonio Napoli, Silvano Frigerio, Emilio Hugues-Salas, Georgios Zervas, Markus Nölle, Johannes Fischer, Andrew Lord, Juan-P.-F.-P. Gimenez
  Next Generation Sliceable Bandwidth Variable Transponder: the Vision of the European Research Project IDEALIST,
  IEEE Communications Magazine, vol. 53, no. 2, pp. 152-162, February 2015
• Isaac Sackey, Klaus Petermann, Colja Schubert, Thomas Richter, Johannes Fischer, Mahmoud Jazayerifar, Francesco Da Ros, Christophe Peucheret
  Kerr nonlinearity mitigation: mid-link spectral inversion versus digital backpropagation in 5×28-GBd PDM 16-QAM signal transmission,
  Journal of Lightwave Technology, IEEE, ISSN: 0733-8724, vol. 33, no. 9, pp. 1821 - 1827, January 2015, doi: 10.1109/JLT.2015.2393152

2014

• Isaac Sackey, Francesco Da Ros, Mahmoud Jazayerifar, Thomas Richter, Christian Meuer, Markus Nölle, Lutz Molle, Christophe Peucheret, Klaus Petermann, Colja Schubert
  Kerr nonlinearity mitigation in 5x28-GBd PDM 16-QAM signal transmission over a dispersion-uncompensated link with backward-pumped distributed Raman amplification,
  Optics Express, vol. 22, no. 22, pp. 27381-27391, September 2014
• Christoph Kottke, Johannes Fischer, Robert Elschner, Felix Frey, Jonas Hilt, Colja Schubert, Daniel Schmidt, Zifeng Wu, Berthold Lankl
  Coherent UDWDM PON with joint subcarrier reception at OLT ,
  Optics Express 2014, vol. 22, no. 14, pp. 16876-16888, July 2014
• Antonio Napoli, Markus Nölle, Danish Rafique, Johannes Fischer, Bernhard Spinnler, Talha Rahman, Mahdi M. Mezghanni, Marc Bohn
  On the next generation bandwidth variable transponders for future flexible optical systems,
  European Conference on Networks and Communications (EuCNC) 2014, June 2014
• Stefan Meister, Hanjo Rhee, A. Al-Saadi, Bülent A. Franke, Sebastian Kupijai, Christoph Theiss, Hans J. Eichler, Bernd Tillack, Lars Zimmermann, Harald H. Richter, David Stolarek, Mateusz Lesny, Christian Meuer, Colja Schubert, Ulrike Woggon
  Silicon Optical Modulator with 3 µm Diode,
  IEEE Photonics Society Optical Interconnects Conference 2014, pp. 4-7, May 2014
• Thomas Richter, Markus Nölle, Felix Frey, Colja Schubert
  Generation and coherent reception of 107-GBd optical Nyquist BPSK,QPSK and 16QAM,
  IEEE Photonics Technology Letter 2014, vol. 26, no. 9, pp. 877-880, May 2014
• Thomas Richter, Carsten Schmidt-Langhorst, Robert Elschner, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe, Colja Schubert
  Coherent in-line substitution of OFDM subcarriers using fiber-frequency conversion and free-running lasers,
  Proc. Optical Fiber Communication Conference (OFC 2014), pp. 9-13, March 2014, postdeadline paper

2013

• Thomas Richter, R. Nouroozi, H. Suche, W. Sohler, Colja Schubert
  PPLN-waveguide based tunable wavelength conversion of QAM data within the C-Band,
  IEEE Photonics Technology Letters, vol. 25, no. 21, pp. 2085-2088, November 2013
• Marc Bohn, Antonio Napoli, Antonio D´Errico, Giuseppe FERRARIS, Matthias Gunkel, Felipe JIMENEZ, Juan-Pedro Fernandez-Palacios, Patricia Layec, Georgios Zervas, Noberto Amaya, Dimitra Simeonidou, Johannes Fischer, Markus Nölle, Colja Schubert, Nicola Sambo, Filippo CUGINI, Piero CASTOLDI, Michela SVALUTO MOREOLO, Josep-M. Fàbrega, Chigo OKONKWO, Huug de Waardt
  Elastic Optical Networks: the Vision of the ICT Project IDEALIST,
  Future Networks & Mobile Summit (FuNeMS) 2013, July 2013
• Mahmoud Jazayerifar, S. Warm, Robert Elschner, D. Kroushkov, Isaac Sackey, Christian Meuer, Colja Schubert, Klaus Petermann
  Performance Evaluation of DWDM Communication Systems with Fiber Optical Parametric Amplifiers,
  Journal of Lightwave Technology, vol. 31, no. 9, pp. 1454-1461, May 2013
• R.H. Derksen, U. Westergren, M. Chacinski, Colja Schubert, Heinz-Gunter Bach, R. Driad, R.E. Makon, V. Hurm, J. Li, Andreas-G. Steffan
  Cost-Efficient High-Speed Components for 100 Gigabit Ethernet Transmission on One Wavelength Only: Results of the HECTO Project,
  IEEE Communications Magazine, vol. 51, no. 5, May 2013
• Robert Elschner, Thomas Richter, T. Kato, S. Watanabe, Colja Schubert
  Distributed ultradense optical frequency-division multiplexing using fiber nonlinearity,
  Journal of Lightwave Technology (Special Issue), vol. 31, no. 4, pp. 628-633, February 2013

2012

• Robert Elschner, Felix Frey, Christian Meuer, Johannes Fischer, Saleem Alreesh, Carsten Schmidt-Langhorst, Lutz Molle, T. Tanimura, Colja Schubert
  Experimental Demonstration of a Format-Flexible Single Carrier Coherent Receiver using Data-Aided Digital Signal Processing,
  Optics Express 20 (27), pp. 28786-28791, December 2012
• Johannes Fischer, Saleem Alreesh, T. Tanimura, Robert Elschner, Felix Frey, Christian Meuer, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert
  Experimental Investigation of 126-Gb/s 6PolSK-QPSK Signals,
  Optics Express (ECOC 2012 special issue), vol. 20, no. 26, pp. B232-B237, December 2012
• T. Tanimura, Markus Nölle, Johannes Fischer, Colja Schubert
  Analytical results on back propagation nonlinear compensator with coherent detection,
  Optics Express (ECOC 2012 special issue), vol. 20, Issue 27, pp. 28779-28785, December 2012
• D. Puris, Carsten Schmidt-Langhorst, K. Luedge, N. Majer, E. Schoell, Klaus Petermann
  Time-domain Model of Quantum-Dot Semiconductor Optical Amplifiers for Wideband Optical Signals,
  Optics Express 20 (24), pp. 27265-27282, November 2012
• J. Li, R. Schmogrow, David Hillerkuss, P. C. Schindler, M. Nazarathy, Carsten Schmidt-Langhorst, S.-B. Ezra, I. Tselniker, C. Koos, W. Freude, Jürg Leuthold
  A self-coherent receiver for detection of PolMUX coherent signals,
  Optics Express 20 (19), pp. 21413-21433, September 2012
• Saleem Alreesh, Johannes Fischer, Markus Nölle, Colja Schubert
  Joint-Polarization Carrier Phase Estimation for PS-QPSK Signals,
  IEEE Photonics Technology Letters, vol. 24, no. 5, pp. 1282-1284, August 2012
• J. Wang, M. Kroh, Thomas Richter, A. Theurer, A. Matiss, Crispin Zawadzki, Ziyang Zhang, Colja Schubert, Andreas-G. Steffan, Norbert Grote, Norbert Keil
  Hybrid-integrated polarization diverse coherent receiver based on polymer PLC ,
  IEEE Photonics Technology Letters, no. 6269056, vol. 24, no. 19, pp. 1718-1721, August 2012, doi: 10.1109/LPT.2012.2213299
• A. Gajda, Lars Zimmermann, Mahmoud Jazayerifar, G. Winzer, H. Tian, Robert Elschner, Thomas Richter, Colja Schubert, Bernd Tillack, Klaus Petermann
  Highly efficient CW parametric conversion at 1550 nm in SOI waveguides by reverse biased p-i-n junction,
  Optics Express 20 (12), pp. 13100-13107, August 2012
• Holger Schmeckebier, Christian Meuer, Dejan Arsenijevic, Gerrit Fiol, Carsten Schmidt-Langhorst, Colja Schubert, G. Eisenstein, Dieter Bimberg
  Wide range wavelength conversion of 40-Gb/s NRZ DPSK signals using a 1.3 µm quantum dot semiconductor optical amplifier,
  IEEE Photonics Technology Letters 24 (13), pp. 1163-1165, July 2012
• A. Maziotis, D. Klonidis, Colja Schubert, R. Nejabati, J.A. Lazaro, D. Erasme, Marco Forzati, E. Tangdiongga, P.O. Hedekvist, Jürg Leuthold, A. Carena, B. Manning, Francesco Fresi, P.P. Millan, X.-Z. Qiu, A. Teixeira, J. Seoane, Christos Kouloumentas, H. Avramopoulos
  EURO-FOS: Integrating Europe’s Expertise on Photonic Subsystems in a Pan-European Photonics Network,
  SPIE Professional magazine, Issue April 2012, April 2012, doi: 10.1117/2.4201204.11, Open Access, http://spie.org/x86602.xml
• Thomas Richter, Robert Elschner, A. Gandhe, Klaus Petermann, Colja Schubert
  Parametric amplification and wavelength conversion of single- and dual-polarization DQPSK signals,
  Journal of Selected Topics in Quantum Electronics, vol. 18, Issue 2, pp. 988-995, March 2012
• A. Hachmeister, Markus Nölle, Lutz Molle, Ronald Freund, Michael Rohde
  Performance Comparison of MSK and QPSK Optical Long Haul DWDM Transmission with Coherent Detection,
  Optics Express, vol. 20, Issue 4, no. 3877-3882, February 2012
• Thomas Richter, E. Palushani, Carsten Schmidt-Langhorst, Reinhold Ludwig, Lutz Molle, Markus Nölle, Colja Schubert
  Transmission of single-channel 16-QAM data signals at terabaud symbol rates,
  Journal of Lightwave Technology, vol. 30, Issue 4, pp. 504-511, February 2012

2011

• Johannes Fischer, Lutz Molle, Markus Nölle, Dirk-Daniel Gross, Carsten Schmidt-Langhorst, Colja Schubert
  Experimental Investigation of 84-Gb/s and 112-Gb/s Polarization-Switched Quadrature Phase-Shift Keying Signals,
  Optics Express, vol. 19, no. 26, pp. B667–B672, December 2011, Invited Paper
• Danish Rafique, M. Mussolin, Jonas Mårtensson, Marco Forzati, Johannes Fischer, Lutz Molle, Markus Nölle, Colja Schubert, A.D. Ellis
  Polarization Multiplexed 16QAM Transmission Employing Modified Digital Back-Propagation,
  Optics Express, vol. 19, no. 26, pp. B805-B810, December 2011, Invited Paper
• Markus Nölle, Johannes Fischer, Lutz Molle, Carsten Schmidt-Langhorst, D.W. Peckham, Colja Schubert
  Comparison of 8×112 Gb/s PS-QPSK and PDM-QPSK Signals over Transoceanic Distances,
  Optics Express, vol. 19, no. 24, pp. 24370-24375, November 2011
• Tomoyuki Kato, Ryo Okabe, Reinhold Ludwig, Robert Elschner, Shigeki Watanabe
  Multi-stage Sequential Optical FDM of 12 x 10 Gb/s Data with 20 GHz Exact Channel Spacing Using Fiber Cross-phase Modulation with Optical Subcarrier Signals,
  Optics Express, vol. 19, Issue 26, pp. B295–B300, November 2011
• M. Bougioukos, Thomas Richter, Christos Kouloumentas, V. Katopodis, R. Harmon, D. Rogers, J. Harrison, A. Poustie, G. Maxwell, Colja Schubert, H. Avramopoulos
  Phase-incoherent DQPSK wavelength conversion using a photonic integrated circuit,
  IEEE Photonics Technology Letters, vol. 23, Issue 22, pp. 1649-1651, November 2011
• M. Selmi, C. Gosset, Markus Nölle, P. Ciblat, Y. Jaouen
  Blockwise Digital Signal Processing for PolMux QAM/PSK Optical Coherent Systems,
  Journal of Lightwave Technology, vol. 29, no. 20, pp. 3070-3082, October 2011
• R. E. Makon, R. Driad, J. Rosenzweig, V. Hurm, Colja Schubert, H. Walcher, M. Schlechtweg, O. Ambacher
  Ultra-High-Speed Transmitter and Receiver ICs for 100 Gbit/s Ethernet using InP DHBTs,
  Compound Semiconductor Integrated Circuit Symposium (CSICS)Compound Semiconductor Integrated Circuit Symposium (CSICS), no. G.1, October 2011, Invited Paper
• H. Hu, R. Nouroozi, Reinhold Ludwig, Carsten Schmidt-Langhorst, H. Suche, W. Sohler, Colja Schubert
  Polarization-Insensitive 320-Gb/s In-Line All-Optical Wavelength Conversion in a 320-km Transmission Span,
  IEEE Photonics Technology Letters 23 (10), no. 627-629, May 2011
• H. Hu, R. Nouroozi, Reinhold Ludwig, B. Huettl, Carsten Schmidt-Langhorst, H. Suche, W. Sohler, Colja Schubert
  Simultaneous Polarization-Insensitive Wavelength Conversion of 80-Gb/s RZ-DQPSK Signal and 40-Gb/s RZ-OOK Signal in a Ti: PPLN Waveguide,
  Journal of Lightwave Technology, vol. 29, no. 8, pp. 1092-1097, April 2011
• Christian Meuer, Carsten Schmidt-Langhorst, René Bonk, Holger Schmeckebier, Dejan Arsenijevic, Gerrit Fiol, Andrey Galperin, Jürg Leuthold, Colja Schubert, Dieter Bimberg
  80 Gb/s wavelength conversion using a quantumdot semiconductor optical amplifier and optical filtering,
  Optics Express 19 (6), pp. 5134-5142, March 2011
• Christian Meuer, Carsten Schmidt-Langhorst, Holger Schmeckebier, Gerrit Fiol, Dejan Arsenijevic, Colja Schubert, Dieter Bimberg
  40 Gb/s wavelength conversion via four-wave mixing in a quantum-dot semiconductor optical amplifier,
  Optics Express 19 (4), pp. 3788-3798, February 2011

2006

• Hans-Georg Weber, Reinhold Ludwig, Sebastian Ferber, Carsten Schmidt-Langhorst, M. Kroh, V. Marembert, C. Boerner, Colja Schubert
  Ultrahigh-Speed OTDM-Transmission Technology,
  IEEE Journal of Lightware Technology, ISSN: 1558-2213 , vol. 24, no. 12, pp. 4616-4627, December 2006, Invited Paper

2024

• Robert Emmerich
  Impact of Multi-Band Transmission on Optical Signal-to-Noise Ratio Measurements,
  Summer School on Optical Communication 2024, Zürich,Switzerland, ETH Zurich, September 2024, doi: https://doi.org/10.3929/ethz-b-000694637
• In-Ho Baek, Oliver Stiewe, Jonas Gläsel, Metin Furkan Ulukan, Alexander Schindler, Felix Ganzer, Trung T. Tran, Robert Elschner, Colja Schubert, Patrick Runge, Martin Schell, Ronald Freund
  Experimental Characterization of a WR3-Coupled Photodiode Transmitter for High-Speed Terahertz Wireless Communication,
  2024 International Topical Meeting on Microwave Photonics (MWP 2024), Pisa, Italy, September 2024, doi: 10.1109/MWP62612.2024.10736276
• Robert Emmerich, Alexander Schindler, Patrick Runge, Colja Schubert, Martin Schell, Ronald Freund
  140 GBd S-C-L-Band Transmission System Enabled by TFLN Coherent Driver Modulator and InP Coherent Receiver Engine,
  Proc. of VDE European Conference on Optical Communication (ECOC), Frankfurt am Main, pp. 1-4, paper W2A.87, September 2024, arXiv: https://datacloud.hhi.fraunhofer.de/s/4SptFBbmjRxk96a
• Nicolas Braig-Christophersen, Aymeric Arnould, Robert Emmerich, Fabian Chowanek, Benjamin J. Puttnam, Juan Carlos Alvarado Zacarias, Kazuhiko Aikawa, Rodrigo Amezuca-Correa, Ruby S. B. Ospina, Hideaki Furukawa, Carsten Schmidt-Langhorst, Georg Rademacher, Colja Schubert, Ronald Freund
  Single-Carrier 2.56 Tb/s (3-mode x 128-GBd x DP-16QAM) Transmission over a 53.7 km Few Mode Fiber,
  ECOC 2024, Frankfurt am Main, September 2024, arXiv: https://datacloud.hhi.fraunhofer.de/s/ttbzyDN9RLWY6CA
• Matheus Ribeiro Sena, Robert Emmerich, Mohammad Behnam Shariati, Ralf-Peter Braun, Marc Geitz, Johannes K. Fischer, Ronald Freund
  Link Tomography: A Tool for Monitoring Optical Network and Designing Digital Twins,
  Proc. of VDE European Conference on Optical Communication (ECOC), Frankfurt am Main, pp. 1-4, [Invited],paper M3E.5, September 2024, arXiv: https://datacloud.hhi.fraunhofer.de/s/AgPmHqNNPpWcnKz
• Cristian Antonelli, A. Mecozzi, Andrea Marotta, Fabio Graziosi, Giammarco Di Sciullo, Qi Wu, D. Ri-bezzo, M. Mazur, Nicolas Fontaine, Lauren Dallachiesa, Roland Ryf, R.S. Luis, Georg Rademacher, Robert Emmerich, Colja Schubert, D. A. Shaji, T. Nakanishi, Takuji Nagashima, Pierre Sillard, D. Bacco, A. Zavatta, M. Zahidy, L.K. Oxenløwe, M. Cappelletti, D. Orsuti, Paola Parolari, A. Gatto, M. Fasano, P. Boffi, N. Sambo, A. Carena, A. Nespola, S. Guerrier, C. Dorize, Jeremie Renaudier, N. Hoghooghi, F. Quinlan
  Space-Division Multiplexed Transmission from the Lab to the Field,
  University of L’Aquila, Frankfurt, September 2024, arXiv: https://datacloud.hhi.fraunhofer.de/s/aWLom4dMRWaXdeA, ECOC 2024
• Andreas Maaßen, Dirk Wiegner
  Industrializable Key Technologies for Energy-Efficient Tbit-Transceivers in 6G Mobile Communication Systems,
  6G Platform Conference, Berlin, July 2024, Nokia Solutions and Networks GmbH&Co KG, Infineon Technologies AG, United Monolithic Semiconductors, LPKF Laser & Electronics GmbH, Innovative Circuit Technologies -
• Guillermo von Hünefeld, Enes Seker, Rijil Thomas, Stephan Suckow, Gregor Ronniger, Mahdi Kaveh, Pooyan Safari, Isaac Sackey, David Stahl, Colja Schubert, Johannes Fischer, Ronald Freund, Max Lemme
  Robust Fabrication of Photonic Neuromorphic Reservoir for Modulation Format Identification,
  Internatinal conference on Neuromorphic Computing and Engineering (ICNCE) -2024, June 3-6., Eurogress Aachen, June 2024
• Pamir Oezsuna, Aymeric Arnould, Emil Luis Spoiden, Nicolas Braig-Christophersen, Robert Emmerich, Ruben S. Luis, Benjamin J. Puttnam, Kazuhiko Aikawa, Carsten Schmidt-Langhorst, Colja Schubert, Ronald Freund, Georg Rademacher
  Experimental Demonstration of a Correlation-Avoidance CMA for Blind Space-Division Multiplexed MIMO Equalization,
  European Conference on Optical Communications ECOC 2024, Frankfurt am Main, pp. page W1C.2, 1471-1474., April 2024
• Guillermo von Hünefeld, Binoy Chacko, Gregor Ronniger, Mahdi Kaveh, Isaac Sackey, Mahtab Aghaeipour Kolyani, Peter Bienstman, Colja Schubert, Ronald Freund
  Neuromorphic reservoir for nonlinear optical signal equalization,
  Photonics West 2024, San Francisco, January 2024, doi: http://dx.doi.org/10.1117/12.3002627

2023

• Isaac Sackey, Ronald Freund, Colja Schubert, Gregor Ronniger, Lars Zimmermann, Tasnad Kernetzky, Norbert Hanik, Yizhao Jia, Ulrike Höfler
  Optimization of Ultra-Broadband Optical Wavelength Conversion in Nonlinear Multi-Modal Silicon-On-Insulator Waveguides,
  2023 23rd International Conference on Transparent Optical Networks (ICTON), Bucharest, Romania, IEEE, July 2023, doi: 10.1109/ICTON59386.2023.10207185
• Isaac Sackey, Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Yu Tanaka, Tsuyoshi Yamamoto, Gregor Ronniger, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, Takeshi Hoshida
  Comparison of Polarization Diversity Configurations of SOI Strip Waveguide-Based Dual-Polarization Wavelength Conversion for S-Band Transmission,
  Opto-Electronics and Communications Conference (OECC), Shanghai, China, IEEE, June 2023, doi: 10.1109/OECC56963.2023.10209749
• Nicolas Braig-Christophersen, Andreas Maaßen, Juan L. Morrone, Carsten Schmidt-Langhorst, Robert Elschner, Robert Emmerich, Johannes Fischer, Colja Schubert
  Experimental and Numerical Evaluation of CAZAC-type Training Sequences for MxM SDM-MIMO Channel Estimation,
  24. VDE ITG Fachtagung Photonische Netze, Leipzig, May 2023, doi: https://ieeexplore.ieee.org/document/7110091
• In-Ho Baek, Oliver Stiewe, Simon Nellen, Garrit William Johannes Schwanke, Robert Elschner, Colja Schubert, Robert Kohlhaas, Martin Schell, Ronald Freund
  32 GBd, 109 Gbit/s Probabilistically Shaped THz Wireless Transmission Using PIN-PD Based Photonic Upconversion,
  Fraunhofer HHI, Berlin, May 2023, doi: 10.1049/icp.2023.2531
• In-Ho Baek, Oliver Stiewe, Simon Nellen, Garrit William Johannes Schwanke, Robert Elschner, Colja Schubert, Robert Kohlhaas, Martin Schell, Ronald Freund
  32 GBd, 109 Gbit/s probabilistically shaped THz wireless transmission using PIN-PD based photonic upconversion,
  49th European Conference on Optical Communications (ECOC 2023), Berlin, May 2023, doi: 10.1049/icp.2023.2531 , arXiv: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10484807
• R.S. Luis, Giammarco Di Sciullo, Georg Rademacher, Benjamin Puttnam, Andrea Marotta, Robert Emmerich, Nicolas Braig-Christophersen, Ralf Stolte, Fabio Graziosi, A. Mecozzi, Colja Schubert, Tetsuya Hayashi, Takuji Nagashima, Cristian Antonelli, Hideaki Furukawa
  Colorless and Directionless ROADM for Meshed Coupled-Core Multicore Fiber Networks,
  OFC, Berlin, March 2023, doi: 10.1364/OFC.2023.Th4C.3

2022

• Isaac Sackey, Robert Elschner, Carsten Schmidt-Langhorst, Gregor Ronniger, Tomoyuki Kato, Takeshi Hoshida, Colja Schubert, Ronald Freund
  Experimental Study of In-line Nonlinearity Mitigation for a 400 Gb/s Dual-Carrier Superchannel with Joint Reception Using a Waveband-Shift-Free OPC,
  2022 IEEE Photonics Conference (IPC), Vancouver, BC, Canada, IEEE, November 2022, doi: 10.1109/IPC53466.2022.9975755, arXiv: https://ieeexplore.ieee.org/document/9975755
• Caio Marciano Santos, Mohammad Behnam Shariati, Robert Emmerich, Carsten Schmidt-Langhorst, Colja Schubert, Johannes K. Fischer
  Automated Dataset Generation for QoT Estimation in Coherent Optical Communication Systems,
  European Conference and Exhibition on Optical Communication 2022, Basel, Switzerland, ISBN: 978-1-957171-15-9, September 2022, arXiv: https://opg.optica.org/abstract.cfm?uri=ECEOC-2022-Tu2.4, paper Tu2.4
• Isaac Sackey, Gregor Ronniger, Carsten Schmidt-Langhorst, Robert Elschner, Md Mahasin Khan, Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Tsuyoshi Yamamoto, Yu Tanaka, Takeshi Hoshida, Colja Schubert, Ronald Freund
  Ultra-Wideband All-optical Interband Wavelength Conversion Using a Low-complexity Dispersion-engineered SOI Waveguide,
  European Conference and Exhibition on Optical Communication 2022, Basel, Switzerland, ISBN: 978-1-957171-15-9, September 2022, arXiv: https://opg.optica.org/abstract.cfm?URI=ECEOC-2022-Th2F.3, paper Th2F.3
• Vegenshanti Valerian Dsilva, Isaac Sackey, Gregor Ronniger, Guillermo von Hünefeld, Binoy Chacko, Colja Schubert, Ronald Freund
  Investigating the Performance and Suitability of Neural Network Architectures for Nonlinearity Mitigation of Optical Signals,
  European Conference and Exhibition on Optical Communication 2022, Basel, Switzerland, ISBN: 978-1-957171-15-9, September 2022, arXiv: Investigating the Performance and Suitability of Neural Network Architectures for Nonlinearity Mitigation of Optical Signals, paper Tu5.27
• Guillermo von Hünefeld, Gregor Ronniger, Pooyan Safari, Isaac Sackey, Rijil Thomas, Enes Seker, Piotr Cegielski, Stephan Suckow, Max Lemme, David Stahl, Sarah Masaad, Emmanuel Gooskens, Peter Bienstman, Colja Schubert, Johannes K. Fischer, Ronald Freund
  Enabling Optical Modulation Format Identification Using an Integrated Photonic Reservoir and a Digital Multiclass Classifier,
  European Conference and Exhibition on Optical Communication 2022, Basel, Switzerland, ISBN: 978-1-957171-15-9, September 2022, arXiv: https://opg.optica.org/abstract.cfm?uri=ECEOC-2022-Tu5.19, paper Tu5.19
• Oliver Stiewe, Robert Elschner, Andreas Maaßen, Stefan Weide, Colja Schubert, Ronald Freund
  Towards High-Capacity THz-Wireless P2MP Communication Systems for 6G,
  2022 52nd European Microwave Conference (EuMC), Milan, Italy, September 2022, doi: 10.23919/EuMC54642.2022.9924314, arXiv: https://ieeexplore.ieee.org/document/9924314
• Georg Rademacher, Ruben S. Luis, Benjamin J. Puttnam, Giammarco Di Sciullo, Robert Emmerich, Nicolas Braig-Christophersen, Andrea Marotta, Antonio Mecozzi, Colja Schubert, Pierre Sillard, Frank Achten, Jun Sakaguchi, Cristian Antonelli, Hideaki Furukawa
  Characterization of the First Field-Deployed 15-mode Fiber,
  European Conference of Optical Communications (ECOC), Basel, Switzerland, September 2022, arXiv: https://ieeexplore.ieee.org/document/9979572
• Ruben S. Luis, Georg Rademacher, Benjamin J. Puttnam, Giammarco Di Sciullo, Andrea Marotta, Robert Emmerich, Nicolas Braig-Christophersen, Ralf Stolte, Fabio Graziosi, Antonio Mecozzi, Colja Schubert, Giuseppe Ferri, Frank Achten, Pierre Sillard, Cristian Antonelli, Hideaki Furukawa
  Demonstration of a Spatial Super Channel Switching SDM Network Node on a Field Deployed 15-Mode Fiber Network,
  European Conference of Optical Communications (ECOC), Basel, Switzerland, September 2022
• Isaac Sackey, Guillermo von Hünefeld, Gregor Ronniger, Colja Schubert, Ronald Freund
  Selected Recent Advances of Optical Signal Processing Novel Concepts for Fuuture Ultra-fast Optical Networks,
  2nd Global Summit and Expo on Lasers, Optics and Photonics (GSELOP 2022), Edinburgh, Scotland, August 2022, doi: https://www.thescientistt.com/laser-optics-photonics/2022/abstract-book.pdf, Invited Paper
• Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Tokuharu Kimura, Yu Tanaka, Tsuyoshi Yamamoto, Isaac Sackey, Gregor Ronniger, Carsten Schmidt-Langhorst, Colja Schubert, Takeshi Hoshida
  Characterization of Dispersion-Tailored Silicon Strip Waveguide for Wideband Wavelength Conversion,
  2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC), Toyama, Japan, July 2022, doi: 10.23919/OECC/PSC53152.2022.9850124, arXiv: https://ieeexplore.ieee.org/document/9850124
• Norbert Hanik, Tasnad Kernetzky, Yizhao Jia, Ulrike Höfler, Ronald Freund, Colja Schubert, Isaac Sackey, Gregor Ronniger, Lars Zimmermann
  Ultra-Broadband Optical Wavelength-Conversion using Nonlinear Multi-Modal Optical Waveguides,
  13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP), Porto, Portugal, ISBN: 978-1-6654-1044-1, July 2022, doi: 10.1109/CSNDSP54353.2022.9908054, arXiv: https://ieeexplore.ieee.org/document/9908054
• In-Ho Baek, Frederik Bart, Robert Elschner, Fred Meier, David Hellmann, Andreas Maaßen, Colja Schubert, Ronald Freund
  Time Adaptive Probabilistic Shaping for Combined Optical/THz Links,
  Photonic Networks; 23th ITG-Symposium, Berlin, Germany, VDE, ISBN: 978-3-8007-5877-7, May 2022, arXiv: https://ieeexplore.ieee.org/document/10484807

2021

• Isaac Sackey, Robert Elschner, Robert Emmerich, Christian Schmidt-Langhorst, Dirk-Daniel Gross, Georg Rademacher, Yoshinari Awaji, Hideaki Furukawa, Takemi Hasegawa, Colja Schubert, Ronald Freund
  Performance Evaluation of an Interband All-Optical Wavelength Converter for Cost-Effective High-Capacity Optical Networks,
  2021 European Conference on Optical Communication (ECOC), Bordeaux, France, IEEE, ISBN: 978-1-6654-3868-1, September 2021, doi: 10.1109/ECOC52684.2021.9606078
• Gabriele Di Rosa, Robert Emmerich, Matheus Ribeiro Sena, Johannes K. Fischer, Colja Schubert, Andre Richter
  Impact of Wavelength-Dependent I/Q Imbalances of Standard C-Band Transceivers in Rate-Adaptive Multiband Systems,
  2021 European Conference on Optical Communication (ECOC), Bordeaux, France, IEEE, ISBN: 978-1-6654-3868-1, September 2021, doi: 10.1109/ECOC52684.2021.9606117
• Gregor Ronniger, Isaac Sackey, Tasnad Kernetzky, Ulrike Höfler, Christian Mai, Colja Schubert, Norbert Hanik, Lars Zimmermann, Ronald Freund, Klaus Petermann
  Efiicient Ultra-Broadband C-to-O-band Converter Based on Multi-mode SOI Waveguides,
  2021 European Conference on Optical Communication (ECOC), Bordeaux, France, IEEE, ISBN: 978-1-6654-3868-1, September 2021, doi: 10.1109/ECOC52684.2021.9606033
• Johannes K. Fischer, Matheus Ribeiro Sena, Robert Emmerich, Mohammad Behnam Shariati, Colja Schubert
  Perspectives of optical transmitter for multi-band transmission systems,
  IEEE Photonics Society Summer Topicals, virtual conference, IEEE, July 2021, Invited Paper

2020

• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert, Ronald Freund
  100 Gb/s Real-Time Transmission over a THz Wireless Fiber Extender Using a Digital-Coherent Optical Modem ,
  Optical Fiber Communication Conference (OFC) 2020, San Diego, California United States, OSA, ISBN: 978-1-943580-71-2, March 2020, doi: 10.1364/OFC.2020.M4I.2, paper M4I.2
• Isaac Sackey, Carsten Schmidt-Langhorst, Colja Schubert, Johannes K. Fischer, Ronald Freund
  Experimental Comparison of Fiber Nonlinearity Mitigation: Intra-modal FWM versus Inter-modal FWM,
  2020 Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, IEEE, ISBN: 978-1-9435-8071-2, March 2020
• Francisco Rodrigues, Ricardo Ferreira, Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert, Antonio Teixeira
  Hybrid fiber-optical/THz-wireless link transmission using low-cost IM/DD optics,
  Optical Fiber Communication Conference (OFC) 2020, San Diego, California United States, OSA, ISBN: 978-1-943580-71-2, March 2020, doi: 10.1364/OFC.2020.W2A.40, paper W2A.40

2019

• Carlos Moises Castro Posada, Robert Elschner, José Machado, Thomas Merkle, Colja Schubert, Ronald Freund
  Ethernet Transmission over a 100 Gb/s Real-Time Terahertz Wireless Link,
  2019 IEEE Globecom Workshops (GC Wkshps), Waikoloa, HI, USA, USA, IEEE, December 2019, doi: 10.1109/GCWkshps45667.2019.9024443
• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert
  100 Gbit/s Terahertz-Wireless Real-Time Transmission Using a Broadband Digital-Coherent Modem,
  2019 IEEE 2nd 5G World Forum (5GWF), Dresden, Germany, IEEE, ISBN: 978-1-7281-3627-1, October 2019, doi: 10.1109/5GWF.2019.8911673
• Felix Frey, Sebastian Stern, Robert Emmerich, Colja Schubert, Johannes Fischer, Robert Fischer
  Coded Modulation using a 512-ary Hurwitz-Integer Constellations,
  Proc. 45th European Conference on Optical Communication (ECOC), Dublin, Ireland, September 2019
• Isaac Sackey, Marko Gruner, Robert Emmerich, Carsten Schmidt-Langhorst, Robert Elschner, Tobias Beckerwerth, Patrick Runge, Martin Schell, Colja Schubert, Ronald Freund
  Dual-Polarization Kramers-Kronig Reception Using Two Concatenated Polarization-Selective Photodiodes,
  Proc. 45th European Conference on Optical Communication (ECOC), Dublin, Ireland, September 2019, paper P15
• Isaac Sackey, Carsten Schmidt-Langhorst, Colja Schubert, Johannes Fischer
  Fiber nonlinearity mitigation using optical phase conjugation based on inter-modal FWM,
  45th European Conference on Optical Communication (ECOC 2019), Dublin, Ireland, IET, ISBN: 978-1-83953-185-9, September 2019, doi: 10.1049/cp.2019.1010
• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert
  Experimental Validation of Coherent DSP for Combined Fibre-Optical / Terahertz-Wireless Links,
  16th International Symposium on Wireless Communication Systems (ISWCS), Oulu, Finland, IEEE, ISBN: 978-1-7281-2527-5 , August 2019, doi: 10.1109/ISWCS.2019.8877328
• Carlos Moises Castro Posada, Robert Elschner, Colja Schubert
  Analysis of Joint Impairment Mitigation in a Hybrid Optic-THz Transmission System,
  2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Cannes, France, IEEE, ISBN: 978-1-5386-6528-2 , July 2019, doi: 10.1109/SPAWC.2019.8815492
• Carsten Schmidt-Langhorst, Johannes Pfeiffer, Robert Elschner, Felix Frey, Robert Emmerich, Robert F. H. Fischer, Colja Schubert
  Experimental Investigation of Security Gaps when using Punctured LDPC Coding in Coherent Systems up to 64-GBd DP-64QAM,
  Photonische Netze - 20. ITG-Fachtagung, Leipzig, Germany, VDE, May 2019
• Robert Elschner, Carlos Moises Castro Posada, Thomas Merkle, Colja Schubert
  100 Gb/s High-Speed Wireless Transmission on a Terahertz Carrier ,
  IEEE International Conference on Computer Communications, Workshop on Ultra-high Broadband Terahertz Communication for 5G and Beyond networks (UBTCN’19), Paris, France, IEEE, April 2019, Invited Paper
• Carlos Moises Castro Posada, Simon Nellen, Robert Elschner, Isaac Sackey, Robert Emmerich, Thomas Merkle, Björn Globisch, David de Felipe Mesquida, Colja Schubert
  32 GBd 16QAM Wireless Transmission in the 300 GHz Band Using a PIN Diode for THz Upconversion,
  Optical Fiber Communication Conference 2019 (OFC), San Diego, California United States, ISBN: 978-1-943580-53-8, March 2019, doi: 10.1364/OFC.2019.M4F.5
• Mustafa Sezer Erkilinc, D. Lavery, P. Bayvel, R.I. Killey, Seb J. Savory, Colja Schubert
  Coherent ONU Designs for 50 Gb/s/λ PON,
  2019 Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, IEEE, ISBN: 978-1-943580-53-8 , March 2019, doi: 10.1364/OFC.2019.Th3F.5, Invited Paper
• Colja Schubert, Carlos Moises Castro Posada, Robert Elschner, Ronald Freund
  Challenges and Applications of THz Wireless Communication Systems,
  ITG-Tagung "Breitbandversorgung in Deutschland", Berlin, Germany, March 2019
• Gilda Raoof Mehrpoor, Carsten Schmidt-Langhorst, Benjamin Wohlfeil, Robert Elschner, Danish Rafique, Robert Emmerich, Annika Dochhan, Iria Lopez, Pedro Rito, Despoina Petousi, Dietmar Kissinger, Lars Zimmermann, Colja Schubert, Bernhard Schmauss, Michael Eiselt, Jörg-Peter Elbers
  64 GBd DP-Bipolar-8ASK Transmission over 120 km SSMF Employing Monolithically Integrated Segmented Driver and MZM in 0.25-µm SiGe BiCMOS Technology,
  Optical Fiber Communication Conference 2019, San Diego, California, United States, ISBN: 978-1-943580-53-8, March 2019, doi: 10.1364/OFC.2019.Tu2A.5
• Mustafa Sezer Erkilinc, D. Lavery, R.I. Killey, Carsten Schmidt-Langhorst, Robert Elschner, Colja Schubert
  Low-complexity Coherent ONU Designs for NG-PONs,
  ITG-Workshop "Modelling of Photonic Components & Systems" (ITG KT3.1), Meiningen, Germany, February 2019
• Simon Nellen, Carlos Moises Castro Posada, Lars Liebermeister, Robert Kohlhaas, Robert Elschner, Colja Schubert, Martin Schell, Björn Globisch, Ronald Freund
  PIN Photodiode Emitters for 32 GBd 16QAM wireless links at 300 GHz,
  44th International Conference on Infrared, Millimeter, and Terahertz Waves (RMMW 2019), Paris, France, January 2019, doi: 10.1109/IRMMW-THz43657.2019.9050608

2018

• Tomoyuki Kato, Shigeki Watanabe, Takahito Tanimura, Carsten Schmidt-Langhorst, Isaac Sackey, Robert Elschner
  Any-to-Any Signal Frequency Shifting over C-band Using Continuously Tuneable Optical Frequency Shifter,
  2018 European Conference on Optical Communication (ECOC), Rome, Italy, IEEE, September 2018, doi: 10.1109/ECOC.2018.8535183
• Isaac Sackey, Robert Elschner, Carsten Schmidt-Langhorst, Robert Emmerich, Colja Schubert
  Practical Trade-Offs for Kramers-Kronig Reception,
  19. ITG-Fachtagung "Photonische Netze", Leipzig, Germany, VDE, ISBN: 978-3-8007-4684-2, June 2018
• Isaac Sackey, Carsten Schmidt-Langhorst, Robert Emmerich, Robert Elschner, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe, T. Hoshida, Colja Schubert
  Distributed Aggregation and Reception of a 400-Gb/s Net Rate Superchannel in a Single-Photodiode 110-GHz Kramers-Kronig Receiver,
  Optical Fiber Communication Conference (OFC 2018), San Diego, CA, USA, March 2018, PDP Th4C.7, postdeadline
• Robert Elschner, Robert Emmerich, Carsten Schmidt-Langhorst, Felix Frey, Pablo Wilke Berenguer, Johannes Fischer, Helmut Grießer, Danish Rafique, Jörg-Peter Elbers, Colja Schubert
  Improving Achievable Information Rates of 64-GBd PDM-64QAM by Nonlinear Transmitter Predistortion,
  OFC, San Diego (USA), pp. 1-3, March 2018, doi: https://doi.org/10.1364/OFC.2018.M1C.2
• T. Kato, S. Watanabe, T. Tanimura, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, T. Hoshida
  Fiber-Optic Frequency Shifting of THz-Range WDM Signal Using Orthogonal Pump-Signal Polarization Configuration,
  Proc. Optical Fiber Communication Conference (OFC) 2018, San Diego, California, USA, March 2018, M3E.3

2017

• Pablo Wilke Berenguer, Johannes Fischer, Felix Frey, Colja Schubert
  Nonlinear Pre-Distortion of Transmitter Components,
  2017 IEEE Photonics Conference (IPC), Orlando, Florida, USA, October 2017, doi: 10.1109/IPCon.2017.8116173, Invited Paper
• Isaac Sackey, Robert Elschner, Carsten Schmidt-Langhorst, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe
  Fiber Nonlinearity Mitigation in 800-km Transmission of a 1.6-Tb/s Superchannel Using Waveband-Shift-Free Optical Phase Conjugation,
  43rd European Conference on Optical Communication (ECOC), Gothenburg, Sweden, September 2017
• Felix Frey, Lutz Molle, Robert Emmerich, Colja Schubert, Johannes Fischer, Robert F. H. Fischer
  Single-step Perturbation-based Nonlinearity Compensation of Intra- and Inter-Subcarrier Nonlinear Interference,
  43rd European Conference on Optical Communication (ECOC), Gothenburg, Sweden, September 2017
• Moritz Baier, Francisco M. Soares, Z. Zheng, Carsten Schmidt-Langhorst, Robert Elschner, Felix Frey, Marko Gruner, Johannes Fischer, Colja Schubert, Martin Moehrle, Norbert Grote, Martin Schell
  112-Gb/s PDM-PAM4 Generation and 80-km Transmission Using a Novel Monolithically Integrated Dual-Polarization Electro-Absorption Modulator InP PIC,
  43rd European Conference on Optical Communication (ECOC), Gothenburg, Sweden, September 2017
• Carsten Schmidt-Langhorst, Robert Elschner, Isaac Sackey, Tomoyuki Kato, Takahito Tanimura, Shigeki Watanabe, Takeshi Hoshida, Colja Schubert
  Advanced Polarization-insensitive Optical Signal Processing Using Orthogonal Signal and Idler Fields,
  OSA Advanced Photonics 2017 , New Orleans, July 2017, doi: https://doi.org/10.1364/PS.2017.PTu1D.3, Invited Paper
• Carsten Schmidt-Langhorst, Robert Elschner, Isaac Sackey, Tomoyuki Kato, Takahito Tanimura, Shigeki Watanabe, Takeshi Hoshida, Colja Schubert
  Advanced Polarization-insensitive Optical Signal Processing Using Orthogonal Signal and Idler Fields,
  Photonics in Switching 2017, New Orleans, Louisiana United States, ISBN: 978-1-943580-30-9, July 2017, doi: 10.1364/PS.2017.PTu1D.3, PTu1D, Invited Paper
• Vahid Forutan, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, Robert F. H. Fischer
  Towards Information-Theoretic Security in Optical Networks,
  18. ITG-Fachtagung "Photonische Netze", Leipzig, Germany, VDE, ISBN: 978-3-8007-4427-5 , May 2017
• Isaac Sackey, Robert Elschner, Carsten Schmidt-Langhorst, Tomoyuki Kato, T. Tanimura, S. Watanabe, T. Hoshida, Colja Schubert
  Novel Wavelength-Shift-Free Optical Phase Conjugator Used For Fiber Nonlinearity Mitigation in 200-Gb/s PDM-16QAM Transmission,
  Optical Fiber Communications Conference and Exhibition (OFC), Los Angeles, California, USA, IEEE, ISBN: 978-1-9435-8023-1, March 2017

2016

• Isaac Sackey, Erik Liebig, Thomas Richter, A. Gajda, Lars Zimmermann, Klaus Petermann, Colja Schubert
  QPSK Phase-Regeneration in a Silicon Waveguide Using Phase-Sensitive Processing,
  European Conference on Optical Communication (ECOC), Dusseldorf, Germany, VDE, ISBN: 978-3-8007-4274-5 , pp. 659-661, September 2016, Invited Paper
• Carsten Schmidt-Langhorst, Robert Elschner, Tomoyuki Kato, T. Tanimura, Shigeki Watanabe, T. Hoshida, Colja Schubert, Thomas Richter
  Coherent Optical Subcarrier Processing and Add/Drop Multiplexing,
  European Conference on Optical Communication (ECOC), Dusseldorf, Germany, VDE, ISBN: 978-3-8007-4274-5 , pp. 616-618, September 2016, Invited Paper
• T. Kato, T. Tanimura, T. Hoshida, Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, S. Watanabe
  THz-Range Optical Frequency Shifter for Dual Polarization WDM Signals Using Frequency Conversion in Fibre,
  European Conference on Optical Communication (ECOC), Düsseldorf, Germany, September 2016, Invited Paper, upgraded
• Tomoyuki Kato, Robert Elschner, Thomas Richter, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe, Pablo Wilke Berenguer
  Subcarrier polarization manipulation by fiber frequency conversion,
  OptoElectronics and Communications Conference (OECC), Niigata, Japan, July 2016
• Robert Elschner
  PHY-Layer-Security – Bedrohungspotential und Lösungsansätze,
  0. ITG-Fachkonferenz "Breitbandversorgung in Deutschland", Berlin, Germany, April 2016, Invited Paper
• Markus Nölle, H. Möller, Colja Schubert, Andrew Robinson, S. Desbruslais, Jörg Schwartz, Ronald Freund
  Application and Benefits of Raman-Enhanced Amplification Schemes in Tomorrow’s Optical Submarine Systems,
  SubOptic 2016, Dubai, UE, pp. 18-21, April 2016
• T. Kato, T. Tanimura, T. Hoshida, Thomas Richter, Carsten Schmidt-Langhorst, Robert Elschner, Colja Schubert, S. Watanabe
  In-line optical signal multiplexing by polarization-insensitive fiber frequency conversion,
  OFC 2016 , Anaheim, CA, USA, March 2016

2015

• Pablo Wilke Berenguer, Johannes Fischer, Lutz Molle, Markus Nölle, Colja Schubert
  Nonlinear digital pre-distortion of transmitter components,
  1st Tobias Eriksson Workshop (TEW) 2015, Gothenburg, Sweden, December 2015, Invited Paper
• Thomas Richter, Saleem Alreesh, Robert Elschner, Johannes Fischer, Tomoyuki Kato, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Distributed 1-Tb/s all-optical aggregation capacity in 125-GHz optical bandwidth by frequency conversion in fiber,
  41st European Conference on Optical Communication (ECOC) 2015, Valencia, Spain, October 2015, PDP.2.5, postdeadline
• Carsten Schmidt-Langhorst, Colja Schubert, Robert Elschner, Felix Frey, Robert Emmerich
  Experimental Analysis of Nonlinear Interference Noise in Heterogeneous Flex-Grid WDM Transmission,
  41st European Conference on Optical Communication (ECOC), Valencia, Spain, September 2015, Tu.1.4.3
• Isaac Sackey, Robert Elschner, Mahmoud Jazayerifar, Christian Meuer, Klaus Petermann, Thomas Richter, Colja Schubert
  Non-reciprocal gain due to counter-propagating pumps in a polarization-independent FOPA with diversity loop,
  41st European Conference on Optical Communication (ECOC) 2015, Valencia, Spain, September 2015
• Talha Rahman, Marc Bohn, Francesco Fresi, Gianluca Meloni, Antonio Napoli, Markus Nölle, Luca Poti, Danish Rafique, Nicola Sambo, Colja Schubert
  Experimental Comparison of 1.28 Tb/s Nyquist WDM vs. Time-Frequency Packing,
  Photonics in Switching, Florence, Italy, September 2015
• Thomas Richter, Robert Elschner, Tomoyuki Kato, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Spatially distributed aggregation of a polarization-division multiplexed superchannel by frequency conversion in fiber,
  41st European Conference and Exhibition on Optical Communication (ECOC), Valencia, Spain, ISBN: 978-8-4608-1741-3, September 2015, doi: 10.1109/ECOC.2015.7341856, Th.1.5.2, contirbuted
• Kai Habel, Robert Elschner, Luz Fernández del Rosal, Johannes Fischer, Ronald Freund, Felix Frey, Jonas Hilt, Volker Jungnickel, Colja Schubert, Stefan Weide
  5 Gbit/s real-time processing using π/4-shift DQPSK for bidirectional radio-over-fibre system,
  17th International Conference on Transparent Optical Networks (ICTON), Budapest, Hungary, July 2015, doi: 10.1109/ICTON.2015.7193479, Invited Paper
• Mahmoud Jazayerifar, Isaac Sackey, Robert Elschner, Francesco Da Ros, Thomas Richter, Christian Meuer, Christophe Peucheret, Colja Schubert, Klaus Petermann
  Prospectives of long-haul WDM transmission systems based on phase-insensitive fiber-optic parametric amplifiers,
  IEEE Photonics Society Tropicals Series Conference 2015, Nassau, Bahamas, July 2015, TuF4.1, DOI: 10.1109/PHOSST.2015.7248272
• Francesco Da Ros, Isaac Sackey, Mahmoud Jazayerifar, Thomas Richter, Robert Elschner, Christian Meuer, Markus Nölle, Lutz Molle, Klaus Petermann, Johannes Fischer, Colja Schubert, Christophe Peucheret
  Optical phase conjugation for nonlinearity compensation in WDM PDM 16-QAM transmission over dispersion-compensated and dispersion-uncompensated links,
  IEEE Photonics Society Summer Topicals Series Conference, Nassau, Bahamas, July 2015, MF1.1, Invited Paper
• Tomoyuki Kato, T. Tanimura, Thomas Richter, Carsten Schmidt-Langhorst, Robert Elschner, Shigeki Watanabe, Colja Schubert
  Efficient signal multiplexing scheme based on optical signal processing,
  18th OptoElectronics and Communications Conference (OECC), Shanghai, China, July 2015, JThB21, Invited Paper
• Moritz Baier, Francisco M. Soares, Christian Meuer, Tom Gaertner, Colja Schubert, Martin Moehrle, Norbert Grote
  50 Gbit/s PAM-4 Transmission Using Directly Modulated Laser Made on Generic InP Integration Platform,
  27th Int. Conf. on Indium Phosphide and Related Materials (IPRM), Santa Barbara, California, USA, June 2015, We2O7.3
• Patricia Layec, Marc Bohn, A. Dupas, Antonio D´Errico, Josep-M. Fàbrega, Johannes Fischer, Francesco Fresi, Emilio Hugues-Salas, Gianluca Meloni, Antonio Napoli, Markus Nölle, Danish Rafique, Talha Rahman, Nicola SAMBO, Colja Schubert, Dimitra Simeonidou, Michela SVALUTO MOREOLO, S. Yan, Y. Yan, Georgios Zervas
  IDEALIST data plane solutions for elastic optical networks,
  European Conference on Networks and Communications (EuCNC) 2015, Paris, France, June 2015
• Saleem Alreesh, Robert Elschner, Johannes Fischer, Felix Frey, Carsten Schmidt-Langhorst, Colja Schubert, Pablo Wilke Berenguer
  Transmission experiment of 2048SP-QAM Nyquist-WDM signals,
  16. ITG Fachtagung "Photonische Netze" 2015, Leipzig, Germany, May 2015
• Robert Elschner, Felix Frey, Carsten Schmidt-Langhorst, Johannes Fischer, Colja Schubert
  FPGA Implementation of a Data-Aided Single-Carrier Frequency-Domain Equalizer for Format-Flexible Receivers,
  16. ITG Konferenz "Photonische Netze" 2015, Leipzig, Germany, May 2015
• Isaac Sackey, Markus Nölle, Thomas Richter, Johannes Fischer, Mahmoud Jazayerifar, Klaus Petermann, Colja Schubert
  Evaluation of Kerr nonlinearity mitigation based on digital backpropagation and digital coherent superposition,
  16. ITG Konferenz "Photonische Netze" 2015, Leipzig, Germany, May 2015
• Markus Nölle, Felix Frey, Robert Elschner, Carsten Schmidt-Langhorst, Johannes Fischer, Colja Schubert
  Performance of CAZAC Training Sequences in Data-Aided Optical Transmission Systems,
  16. ITG Konferenz "Photonische Netze" 2015, Leipzig, Germany, May 2015
• Emilio Riccardi, Marc Bohn, Piero CASTOLDI, Antonio D´Errico, Josep-M. Fàbrega, Johannes Fischer, Matthias Gunkel, Emilio Hugues-Salas, Andrew Lord, Antonio Napoli, Markus Nölle, Annachiara Pagano, J. Palacios, Danish Rafique, Talha Rahman, Nicola SAMBO, Dimitra Simeonidou, Michela SVALUTO MOREOLO, Georgios Zervas
  Sliceable Bandwidth Variable Transponders for Elastic Optical Networks: The Idealist Vision,
  Fotonica Conference, Torino, Italy, May 2015
• Carsten Schmidt-Langhorst, Robert Elschner, Tomoyuki Kato, Thomas Richter, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Versatile coherent in-line 4-, 16-, 32-QAM subcarrier add/drop-multiplexing by optical frequency conversion,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, doi: 10.1364/OFC.2015.M3F.1, M3F.1
• Markus Nölle, Robert Elschner, Johannes Fischer, Felix Frey, Carsten Schmidt-Langhorst, Colja Schubert
  Investigation of CAZAC Sequences for Data-Aided Channel Estimation Considering Nonlinear Optical Transmission,
  Proc. Optical Fiber Communication Conference (OFC 2015), Los Angeles, California, USA, March 2015, doi: 10.1364/OFC.2015.Th3G.2
• Tomoyuki Kato, Robert Elschner, Thomas Richter, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Broadband coherent-optical add/drop multiplexing over 400-GHz bandwidth by fiber frequency conversion,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, doi: 10.1364/OFC.2015.M3F.2, M3F.2
• Thomas Richter, Robert Elschner, Tomoyuki Kato, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Generation of ultra-dense superchannels using frequency conversion in optical fibers,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, doi: 10.1364/OFC.2015.W3C.3, W3C.3, Invited Paper
• Zhixin Liu, Shaif-ul Alam, Martin Becker, Yong Chen, Alex-M. Heidt, Brian Kelly, Zhihong Li, John O´Carroll, Marco Petrovich, Richard Phelan, Francesco Poletti, David-J. Richardson, Thomas Richter, Colja Schubert, Radan Slavík, Natalie-V. Wheeler, John-P. Wooler
  52.6 Gbit/s single-channel directly-modulated optical transmitter for 2-µm spectral region,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, Th1E.6
• Zhixin Liu, David-J. Richardson, Thomas Richter, Colja Schubert, Radan Slavík
  Practical considerations on discrete multi-tone transmission for cost-effective access networks,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, M3J4
• Holger Schmeckebier, Dejan Arsenijevic, Dieter Bimberg, René Bonk, S. Koenig, C. Koos, B. Lingnau, K. Lüdge, Christian Meuer, Th. Pfeiffer, Colja Schubert, Mirko Stubenrauch, Anissa Zeghuzi
  Ultra-Broadband Bidirectional Dual-Band Quantum Dot Semiconductor Optical Amplifier,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA, March 2015, Tu3I.7
• Brau Gomez Saavedra, Heinz-Gunter Bach, Jung Han Choi, Marko Gruner, Christian Meuer, Martin Schell, Colja Schubert, Karl-Otto Velthaus, Norman Wolf, Lei Yan
  First 105 Gb/s Low Power, Small Footprint PAM-8 Impedance-engineered TOSA with InP MZ-Modulator and Customized Driver IC using Predistortion,
  Proc. Optical Fiber Communication Conference (OFC) 2015, Los Angeles, California, USA , March 2015, doi: 10.1364/OFC.2015.Th4E.4, Th4.4

2014

• Francesco Da Ros, A. Abboud, J. Bruns, C. G. Schäffer, Christian Meuer, Lutz Molle, Markus Nölle, Klaus Petermann, A. Rahim, Isaac Sackey, Colja Schubert, Sebastian Schwarz, K. Voigt, G. Winzer, Lars Zimmermann
  Experimental demonstration of an OFDM receiver based on a silicon-nanophotonic discrete Fourier transform filter,
  2014 IEEE Photonics Conference, San Diego, California USA, IEEE, October 2014, doi: 10.1109/IPCon.2014.6995253, MG2.5
• Isaac Sackey, Francesco Da Ros, Robert Elschner, Mahmoud Jazayerifar, Christian Meuer, Klaus Petermann, Christophe Peucheret, Thomas Richter, Colja Schubert
  Design and performance evaluation of an OPC device using a dual-pump polarization-independent FOPA,
  40th European Conference and Exhibition on Optical Communication 2014, Cannnes, France, September 2014, doi: 10.1109/ECOC.2014.6963845, Tu.1.4.4
• Thomas Richter, Robert Elschner, Tomoyuki Kato, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura, Shigeki Watanabe
  Tolerances for add/drop operation of a coherent multiplexing node based on fiber frequency conversion,
  40th European Conference and Exhibition on Optical Communication 2014, Cannnes,France, September 2014, doi: 10.1109/ECOC.2014.6963828, P.3.2
• Francesco Da Ros, Robert Elschner, Mahmoud Jazayerifar, Christian Meuer, Markus Nölle, Klaus Petermann, Christophe Peucheret, Thomas Richter, Isaac Sackey, Colja Schubert
  Kerr nonlinearity compensation in a 5×28-GBd PDM 16-QAM WDM system using fiber-based optical phase conjugation,
  40th European Conference and Exhibition on Optical Communication 2014, Cannnes,France, September 2014, P.5.3
• Mahmoud Jazayerifar, Robert Elschner, Christian Meuer, Klaus Petermann, Isaac Sackey, Colja Schubert, S. Warm
  Impact of SBS on polarization-insensitive single-pump optical parametric amplifiers based on a diversity loop scheme,
  40th European Conference and Exhibition on Optical Communication 2014, Cannnes,France, September 2014, doi: 10.1109/ECOC.2014.6963968, Tu.4.6.4
• Robert Elschner, Felix Frey, Carsten Schmidt-Langhorst, Johannes Fischer, Colja Schubert
  Data-Aided DSP for Flexible Transceivers,
  Signal Processing in Photonic Communications (SPPCom), San Diego, USA, July 2014, SW1C.1, Invited Paper
• T. Roethlingshoefer, Thomas Richter, G. Onishchukov, Colja Schubert, B. Schmauss, G. Leuchs
  All-optical multilevel amplitude and phase regeneration,
  IEEE Photonics Society Summer Topicals Series Conference, Montreal, Canada, IEEE, July 2014, MD2.3
• R. Nouroozi, H. Suche, H. Hu, Thomas Richter, A. Babazadeh, Colja Schubert, W. Sohler
  Efficient ultra-fast all-optical wavelength converters with Ti:PPLN waveguides,
  16th International Conference on Transparent Optical Networks (ICTON) 2014, Graz, Austria, July 2014, PICAW I-2, Invited Paper
• Isaac Sackey, Robert Elschner, Mahmoud Jazayerifar, Christian Meuer, Lutz Molle, Markus Nölle, Klaus Petermann, Thomas Richter, Colja Schubert, S. Warm
  Characterization of a fiber-optical parametric amplifier in a 5 x 28-GBd 16-QAM DWDM system,
  Proc. Optical Fiber Communication Conference (OFC) 2014, San Francisco, USA, March 2014, doi: 10.1364/OFC.2014.W3E.3, Tu3A.1
• Antonio Napoli, Danish Rafique, Bernhard Spinnler, Maxim Kuschnerov, Markus Nölle, Marc Bohn
  Performance Dependence of Single-Carrier Digital Back-Propagation on Fiber Types and Data Rates,
  Proc. Optical Fiber Communication Conference (OFC 2014), San Francisco, USA, March 2014
• T. Tanimura, Robert Elschner, Tomoyuki Kato, S. Oda, Ryo Okabe, J.C. Rasmussen, Thomas Richter, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  Coherent reception and 126 GHz bandwidth digital signal processing of CO-OFDM superchannel generated by fiber frequency conversion,
  Proc. Optical Fiber Communication Conference (OFC) 2014, San Francisco, USA, March 2014, doi: 10.1364/OFC.2014.Tu3A.1, Tu3A.1
• Markus Nölle, Felix Frey, Robert Elschner, Carsten Schmidt-Langhorst, Antonio Napoli, Colja Schubert
  Performance Comparison of Different 8QAM Constellations for the Use in Flexible Optical Networks,
  Proc. Optical Fiber Communication Conference (OFC) 2014, San Francisco, USA, March 2014, W3B.2
• Thomas Richter, Robert Elschner, Tomoyuki Kato, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  Distributed generation of a 400-Gb/s Nyquist 16QAM dense superchannel by fiber-frequency conversion,
  Proc. Optical Fiber Communication Conference (OFC) 2014, San Francisco, USA, March 2014, doi: 10.1364/OFC.2014.Th1D.3, Th1D.3
• Isaac Sackey, Markus Nölle, Thomas Richter, Johannes Fischer, Mahmoud Jazayerifar, Klaus Petermann, Colja Schubert
  Evaluation of Kerr nonlinearity mitigation based on digital backpropagation and digital coherent superposition,
  15. ITG-Workshop 5.3.1 "Optische Multiplextechniken", Berlin, Germany, February 2014
• T. Roethlingshoefer, G. Leuchs, G. Onishchukov, Thomas Richter, B. Schmauss, Colja Schubert, B. Stiller
  All-optical signal regeneration of advanced modulation formats ,
  Proc. SPIE 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices and Applications XIII, San Francisco, USA, February 2014, Invited Paper

2013

• Thomas Richter
  Generation and optical processing of 100-GBd QAM signals,
  6th International Symposium on Ultrafast Photonic Technologies,University of Rochester, Rochester,England, October 2013, ,Oct. 21-22,2013; available online: http://www.optics.rochester.edu/workgroups/knox/myweb/ISUPT2013/archive/Richter.pdf (last check August 2014)
• Saleem Alreesh, Johannes Fischer, Pablo Wilke Berenguer, Colja Schubert
  Blind Adaptive Equalization for 6PolSK-QPSK Signals,
  Proc. 39th European Conference on Optical Communication (ECOC) 2013, London, UK, September 2013, Mo.4.D.3
• Carsten Schmidt-Langhorst, Felix Frey, Markus Nölle, Robert Elschner, Christian Meuer, Pablo Wilke Berenguer, Colja Schubert
  Optimization of Subcarrier Spacing of 400-Gb/s Dual-Carrier Nyquist PDM-16QAM in a Flexgrid Scenario,
  Proc. 39th European Conference on Optical Communication (ECOC) 2013, London, UK, September 2013, P.5.1
• Thomas Richter, Robert Elschner, Colja Schubert
  QAM phase-regeneration in a phase-sensitive fiber-amplifier,
  Proc. 39th European Conference on Optical Communication (ECOC) 2013, London, UK, September 2013, We.3.A.2
• Tomoyuki Kato, Ryo Okabe, Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  Precise remote optical carrier addition into 200-Gb/s CO-OFDM channel using fiber frequency conversion,
  Proc. 39th European Conference on Optical Communication (ECOC) 2013, London, UK, September 2013, We.1.C.6
• Robert Elschner, Felix Frey, Carsten Schmidt-Langhorst, Johannes Fischer, Markus Nölle, Colja Schubert
  Software-defined Transponders for Future Flexible Grid Networks,
  Photonic Networks and Devices (NETWORKS 2013), Rio Grande, USA, July 2013, NT2C.4, Invited Paper
• Thomas Richter, Robert Elschner, Colja Schubert
  Phase-regeneration of 2ASK-BPSK in a one-mode phase-sensitive amplifier,
  IEEE Photonics Society Summer Topicals Meeting Series Conference, Waikaloa, USA, IEEE, July 2013, TuD2.2
• T. Roethlingshoefer, Thomas Richter, Colja Schubert, G. Onishchukov, B. Schmauss, G. Leuchs
  Phase-preserving amplitude regeneration of a two-level-amplitude modulation format,
  10th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Kyoto, Japan, June 2013, TuPO-1
• Tomoyuki Kato, Ryo Okabe, Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  Removal of local frequency fluctuation in distributed coherent-optical OFDM,
  18th OptoElectronics and Communications Conference (OECC), Kyoto, Japan, June 2013, MO1-7
• Robert Elschner, Felix Frey, Christian Meuer, Johannes Fischer, Saleem Alreesh, Carsten Schmidt-Langhorst, Lutz Molle, T. Tanimura, Colja Schubert
  Data-Aided Digital Signal Processing for Format-Flexible Transponders,
  Proc. 14. ITG-Fachtagung "Photonische Netze" 2013, Leipzig, Germany, pp. 141-145, May 2013
• Mahmoud Jazayerifar, S. Warm, Robert Elschner, D. Kroushkov, Isaac Sackey, Christian Meuer, Colja Schubert, Klaus Petermann
  Investigation of Nonlinear Effects in Long-Haul DWDM Communication Systems with Fiber Optic Parametric In-line Amplifiers,
  Proc. 14. ITG-Fachtagung "Photonische Netze" 2013, Leipzig, Germany, pp. 51-53, May 2013
• Lutz Molle, Markus Nölle, Colja Schubert
  Single- versus Dual-Carrier Transmission for Installed Submarine Cable Upgrades,
  SubOptic 2013, Paris, France, April 2013
• Isaac Sackey, Thomas Richter, Christian Meuer, Robert Elschner, Mahmoud Jazayerifar, Klaus Petermann, Colja Schubert
  Characterization of polarization insensitive FOPA using a polarization-maintaining highly non-linear fiber,
  Proc. Optical Fiber Communication Conference (OFC) 2013, Los Angeles, California, USA, March 2013, OTu2D.2
• M.L. Nielsen, Lutz Molle, Thomas Richter, Colja Schubert
  Feasibility study of SOA-preamplified coherent reception for 112 Gb/s DP-QPSK unamplified Link,
  Proc. Optical Fiber Communication Conference (OFC) 2013, Los Angeles, California, USA, March 2013, JTh2A.45
• Thomas Richter, Robert Elschner, Carsten Schmidt-Langhorst, Tomoyuki Kato, Shigeki Watanabe, Colja Schubert
  Narrow guard-band distributed nyquist-WDM using fiber frequency conversion,
  Proc. Optical Fiber Communication Conference (OFC) 2013, Los Angeles, California, USA, March 2013, OTh1C.1
• T. Tanimura, Saleem Alreesh, Johannes Fischer, Carsten Schmidt-Langhorst, Felix Frey, Christian Meuer, Robert Elschner, Lutz Molle, Colja Schubert
  Nonlinear Transmission of 6PolSK-QPSK Signals using Coded Modulation and Digital Back Propagation,
  Proc. Optical Fiber Communication Conference (OFC) 2013, Los Angeles, California, USA, March 2013, OTu3B.3
• Saleem Alreesh, T. Tanimura, Johannes Fischer, Carsten Schmidt-Langhorst, Felix Frey, Christian Meuer, Robert Elschner, Lutz Molle, Colja Schubert
  Four dimensional coded modulation,
  14. ITG-Workshop 5.3.1 "Optische Kommunikationssysteme - offline to realtime", Stuttgart, Germany, February 2013
• Markus Nölle, Colja Schubert, Ronald Freund
  Techniques to Realize Flexible Optical Terabit per Second Transmission Systems,
  Proc. SPIE 8646, Optical Metro Networks and Short-Haul Systems V, San Francisco, CA, USA , 2013, Invited Paper, invited

2012

• Robert Elschner, Felix Frey, Christian Meuer, Johannes Fischer, Saleem Alreesh, Carsten Schmidt-Langhorst, Lutz Molle, T. Tanimura, Colja Schubert
  Experimental Demonstration of a Format-Flexible Single Carrier Coherent Receiver using Data-Aided Digital Signal Processing,
  Proc. 38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, September 2012, We.1.A.4
• Johannes Fischer, Saleem Alreesh, Robert Elschner, Felix Frey, Christian Meuer, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert, T. Tanimura
  Experimental Investigation of 126-Gb/s 6PolSK-QPSK Signals,
  38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, pp. B232-B237, September 2012, doi: 10.1109/ECOC.2012.6706240
• Colja Schubert, Johannes Fischer, Carsten Schmidt-Langhorst, Robert Elschner, Lutz Molle, Markus Nölle, Thomas Richter
  New trends and challenges in optical digital transmission systems,
  Proc. Photonics in Switching Conference (PS 2012), Ajaccio, Corsica Island, France, September 2012, Th-S14-I08, Invited Paper
• Colja Schubert, Johannes Fischer, Carsten Schmidt-Langhorst, Robert Elschner, Lutz Molle, Markus Nölle, Thomas Richter
  New trends and challenges in optical digital transmission systems,
  Proc. 38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, September 2012, We.1.C.1, Invited Paper
• J. Wang, Norbert Grote, Norbert Keil, Thomas Richter, Colja Schubert, Crispin Zawadzki, Ziyang Zhang, M. Kroh, A. Matiss, A. Theurer
  Optical coherent receivers on polymer hybrid-integration platform,
  Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC), Hangzhou, China, September 2012
• T. Tanimura, Markus Nölle, Johannes Fischer, Colja Schubert
  Analytical Results on Back Propagation Nonlinear Compensator in Coherent Transmission Systems,
  Proc. 38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, September 2012, p3.11
• Daniel Schmidt, Berthold Lankl, Johannes Fischer, Jonas Hilt, Colja Schubert
  Real-Time Implementation of a Parallelized Feedforward Timing Recovery Scheme for Receivers in Optical Access Networks,
  Proc. 38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, September 2012, Mo.1.A.1
• Thomas Richter, B. Corcoran, S. L. Olsson, C. Lundström, Magnus Karlsson, Colja Schubert, Peter-A. Andrekson
  Experimental characterization of a phase-sensitive four-mode fiber-optic parametric amplifier,
  Proc. 38th European Conference on Optical Communication (ECOC 2012), Amsterdam, Netherlands, September 2012, Th.1.F.1
• A. Gajda, G. Winzer, Bernd Tillack, Klaus Petermann, Lars Zimmermann, H. Tian, Robert Elschner, Thomas Richter, Colja Schubert
  High efficiency CW four-wave mixing at 1.5 µm in SOI nano-rib waveguides using p-i-n diodes,
  Proc. 9th International Conference on Group IV Photonics, San Diego, USA, August 2012, ThD7
• Johannes Fischer, Markus Nölle, Lutz Molle, Carsten Schmidt-Langhorst, Jonas Hilt, Reinhold Ludwig, Colja Schubert
  Beyond 100G - High capacity transport technologies for next generation optical core networks,
  Future Network and Mobile Summit 2012, Berlin, Germany, July 2012
• Johannes Fischer, Markus Nölle, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert
  Is PS-QPSK really an alternative to PDM-QPSK?,
  ITG-Fachtagung "Photonische Netze", Leipzig, Germany, May 2012
• M. Kroh, Norbert Grote, Norbert Keil, A. Matiss, Thomas Richter, Colja Schubert, Andreas-G. Steffan, A. Theurer, J. Wang, Crispin Zawadzki, Ziyang Zhang
  Hybrid integrated polymer - indium phosphide dual-polarization receiver for QPSK and QAM modulation formats,
  Proc. 13. ITG Fachtagung Photonische Netze 2012, Leipzig (DE) , May 2012, P01
• Robert Elschner, Thomas Richter, Tomoyuki Kato, Shigeki Watanabe, Colja Schubert
  Distributed coherent optical OFDM multiplexing using fiber frequency conversion and free-running lasers,
  Proc. Optical Fiber Communication Conference (OFC 2012), Los Angeles, CA, USA, March 2012, PDP5C.8, postdeadline
• Thomas Richter, M. Kroh, J. Wang, A. Theurer, Crispin Zawadzki, Ziyang Zhang, Norbert Keil, Andreas-G. Steffan, Colja Schubert
  Integrated polarization-diversity coherent receiver on polymer PLC for QPSK and QAM signals,
  Proc. Optical Fiber Communication Conference (OFC 2012),paper OW3G.1, Los Angeles,USA, March 2012, OW3G.1
• M. Leifgen, O. Benson, Robert Elschner, Colja Schubert
  The Implementation of a Quantum Key Distribution Scheme based on the Frequency-Time Uncertainty,
  Quantum Information and Measurement Conference (QIM), Berlin, Germany, March 2012
• Tomoyuki Kato, Robert Elschner, Thomas Richter, Ryo Okabe, Christian Meuer, Ute Troppenz, Colja Schubert, Shigeki Watanabe
  Chirp removal from directly modulated laser signals by two-stage fiber cross-phase modulation,
  Proc. Optical Fiber Communication Conference (OFC 2012), Los Angeles, CA, USA, March 2012, OTh4H.2
• Thomas Richter, Christian Meuer, Reinhold Ludwig, Colja Schubert
  Black-box phase-sensitive fiber-optic parametric amplifier assisted by a semiconductor optical amplifier,
  Proc. Optical Fiber Communication Conference (OFC 2012), Los Angeles, CA, USA, March 2012, OM3B.4
• E. Palushani, Thomas Richter, Reinhold Ludwig, Colja Schubert, Hansen Mulvad, A.T. Clausen, L.K. Oxenløwe
  OTDM-to-WDM conversion of complex modulation formats by time-domain optical fourier transformation,
  Proc. Optical Fiber Communication Conference (OFC 2012), Los Angeles, CA, USA, March 2012, OTh3H.2
• Markus Nölle, Johannes Fischer, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert
  Influence of Channel Spacing on Ultra Long-Haul WDM Transmission of 8×112 Gb/s PS-QPSK Signals,
  Proc. Optical Fiber Communication Conference (OFC 2012), Los Angeles, CA, USA, March 2012

2011

• Johannes Fischer, Markus Nölle, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert
  Nyquist-WDM und PS-QPSK für zukünftige Tbit/s Systeme,
  Workshop der ITG-Fachgruppe 5.3.1 "Modellierung photonischer Komponenten und Systeme", Karlsruhe, Germany, November 2011
• Robert Elschner, Thomas Richter, Colja Schubert
  Characterization of FWM-induced crosstalk for WDM operation of a fiber-optical parametric amplifier,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011
• Johannes Fischer, Lutz Molle, Markus Nölle, D.-D. Groß, Colja Schubert
  Experimental Investigation of 28-GBd PS-QPSK Signals,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011, Mo.2.B.1
• M. Kroh, J. Wang, A. Theurer, Crispin Zawadzki, Daniel Schmidt, Reinhold Ludwig, M. Lauermann, Andreas Beling, A. Matiss, Colja Schubert, Andreas-G. Steffan, Norbert Keil, Norbert Grote
  Coherent Receiver for 100G Ethernet Applications Based on Polymer Planar Lightwave Circuit,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011
• Tomoyuki Kato, Ryo Okabe, Reinhold Ludwig, Robert Elschner, Colja Schubert, Shigeki Watanabe
  12-Stage Sequential Optical FDM of 120 Gb/s (12x10 Gb/s) Data in 240-GHz Bandwidth using Fiber Cross-phase Modulation with Optical Subcarrier Signals,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011
• Danish Rafique, M. Mussolin, Jonas Mårtensson, Marco Forzati, Johannes Fischer, Lutz Molle, Markus Nölle, Colja Schubert, A.D. Ellis
  Polarization Multiplexed 224 Gb/s 16QAM Transmission Employing Digital Back-Propagation,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011, We.8.B.6
• Christian Meuer, G. Eisenstein, Holger Schmeckebier, Carsten Schmidt-Langhorst, Gerrit Fiol, Dejan Arsenijevic, Colja Schubert, Dieter Bimberg
  Wavelength Conversion of 40-Gb/s NRZ DPSK Signals within a 45-nm range using a 1.3µm Quantum-Dot Semiconductor Optical Amplifier,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011, We.10.P1.26
• E. Palushani, Carsten Schmidt-Langhorst, Thomas Richter, Markus Nölle, Reinhold Ludwig, Colja Schubert
  Transmission of a serial 5.1-Tb/s data signal using 16-QAM and coherent detection,
  Proc. 37th European Conference on Optical Communication (ECOC 2011), Geneva, Switzerland, September 2011, We.8.B.5
• Reinhold Ludwig, Thomas Richter, E. Palushani, Carsten Schmidt-Langhorst, Lutz Molle, Johannes Fischer, Markus Nölle, Robert Elschner, Colja Schubert
  Ultrafast transmission systems using coherent technology,
  Proc. 18th Optoelectronics and Communications Conference (OECC 2011), Kaohsiung, Taiwan, July 2011, 8D1 1 , Invited Paper
• Dieter Bimberg, Holger Schmeckebier, Christian Meuer, Carsten Schmidt-Langhorst, René Bonk, Dejan Arsenijevic, Gerrit Fiol, Andrey Galperin, Jürg Leuthold, J. Li, Colja Schubert
  Quantum-Dot Semiconductor Optical Amplifier for Filter-Assisted 80-Gb/s Wavelength Conversion,
  Proc. 13th International Conference on Transparent Optical Networks (ICTON 2011), Stockhom, Sweden, June 2011, Invited Paper
• Robert Elschner, Thomas Richter, Colja Schubert
  Parametrische Verstärker als Option für die optische Breitbandverstärkung,
  12. ITG Fachtagung Photonische Netze 2011, Leipzig (Germany), pp. 141-148, May 2011
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Carsten Schmidt-Langhorst, C.C. Leonhardt, A. Matiss, Colja Schubert
  Coherent Detection Using Parallel Optical Sampling,
  12. ITG Fachtagung Photonische Netze 2011, Leipzig, Germany, pp. 32-36, May 2011
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Markus Nölle, Andreas Beling, C.C. Leonhardt, A. Matiss, A. Umbach, R. Kunke, Heinz-Gunter Bach, Colja Schubert
  Integrated Coherent Receiver Modules for 100G Ethernet and Beyond,
  ITG Symposium Proceedings of Photonic Networks , Leipzig, Germany, May 2011
• Robert Elschner, Thomas Richter, Colja Schubert
  Parametric amplification as an option for optical broadband amplification,
  12. ITG Fachtagung Photonische Netze, Leipzig, Germany, pp. 141-148, May 2011
• Robert Elschner, Thomas Richter, Markus Nölle, Jonas Hilt, Colja Schubert
  Parametric amplification of 28-GBd NRZ-16QAM signals,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, OThC2
• A. Matiss, Markus Nölle, Johannes Fischer, C.C. Leonhardt, Reinhold Ludwig, Jonas Hilt, Lutz Molle, Carsten Schmidt-Langhorst, Colja Schubert
  Characterization of an Integrated Coherent Receiver for 224 Gb/s Polarization Multiplexed 16-QAM Transmission,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, JWA026
• Andreas Beling, N. Ebel, A. Matiss, G. Unterbörsch, Markus Nölle, Johannes Fischer, Jonas Hilt, Lutz Molle, Colja Schubert, F. Verluise, L. Fulop
  Fully-Integrated Polarization-Diversity Coherent Receiver Module for 100G DP-QPSK,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, OML5
• Thomas Richter, Robert Elschner, A. Gandhe, Colja Schubert
  Parametric amplification of 112 Gbit/s polarization multiplexed DQPSK signals in a fiber loop configuration,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, OThC4
• Tomoyuki Kato, Ryo Okabe, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  All-Optical THz-band Frequency Multiplexing on A Single Optical Carrier Using Fiber Cross-Phase Modulation,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, OThC5
• J. Li, Carsten Schmidt-Langhorst, R. Schmogrow, David Hillerkuss, M. Lauermann, M. Winter, K. Worms, Colja Schubert, C. Koos, W. Freude, Jürg Leuthold
  Self-Coherent Receiver for PolMUX Coherent Signals,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles,USA, March 2011, OMV5
• Thomas Richter, E. Palushani, Carsten Schmidt-Langhorst, Markus Nölle, Reinhold Ludwig, Johannes Fischer, Colja Schubert
  Single wavelength channel 10.2 Tb/s TDM-data capacity using 16-QAM and coherent detection,
  Proc. Optical Fiber Communication Conference (OFC 2011), Los Angeles, CA, USA, March 2011, PDP-A9, postdeadline

2010

• R. E. Makon, R. Driad, Colja Schubert, Johannes Fischer, R. Lösch, H. Walcher, J. Rosenzweig, M. Schlechtweg, O. Ambacher
  107-112 Gbit/s Fully Integrated CDR/1:2 DEMUX Using InP-Based DHBTs,
  European Microwave Week, Paris,France, October 2010, EuMIC14-1, September 26 - October 1st,2010,Paris,France,paper EuMIC14-1
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Carsten Schmidt-Langhorst, C.C. Leonhardt, A. Matiss, Colja Schubert
  Digital Coherent Receiver Based on Parallel Optical Sampling,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, Th.10.A.4, September 19-23,2010,Turin (Italy),paper Th.10.A.4
• Colja Schubert, J. Li, Heinz-Gunter Bach, G.G. Mekonnen, R. E. Makon, R.H. Derksen, V. Hurm, A. Djupsjöbacka, M. Chacinski, U. Westergren, Andreas-G. Steffan, R. Driad
  Characterization of a pin-TWA Photoreceiver in OOK-System Experiments up to 112 Gb/s,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, Tu.3.A.2, September 19-23,2010,Turin (Italy),paper Tu.3.A.2
• Robert Elschner, Thomas Richter, Lutz Molle, Klaus Petermann, Colja Schubert
  Single-pump FWM-wavelength conversion in HNLF using coherent receiver-based electronic compensation,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, P3.17, September 19-23,2010,Turin (Italy) P3.17
• Carsten Schmidt-Langhorst, Christian Meuer, Andrey Galperin, Holger Schmeckebier, Reinhold Ludwig, D. Puris, Dieter Bimberg, Klaus Petermann, Colja Schubert
  80 Gb/s Multi-Wavelength Booster Amplification in an InGaAs/GaAs Quantum-Dot Semiconductor Optical Amplifier,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, Mo.1.F.6, September 19-23,2010,Turin (Italy),paper Mo.1.F.6
• J. Li, Colja Schubert, R.H. Derksen, R. E. Makon, V. Hurm, A. Djupsjöbacka, M. Chacinski, U. Westergren, Heinz-Gunter Bach, G.G. Mekonnen, Andreas-G. Steffan, R. Driad, H. Walcher, J. Rosenzweig
  112 Gb/s Field Trial of Complete ETDM System Based on Monolithically Integrated Transmitter & Receiver Modules for Use in 100GbE,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, P4.03, September 19-23,2010,Turin (Italy),poster P4.03
• G.G. Mekonnen, Heinz-Gunter Bach, Reinhard Kunkel, Colja Schubert, Detlef Pech, Agnieszka Konczykowska, Filipe Jorge, Andre Scavennec, Muriel Riet
  Co-Packaged 107 Gb/s Photoreceiver for Direct Detection Comprising InP-based pinTWA and DEMUX,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, Th.10.D.1, September 19-23,2010,Turin (Italy),paper Th.10.D.1
• R.H. Derksen, K. Wang, J. Li, A. Djupsjöbacka, G. Jacobsen, M. Chacinski, U. Westergren, S. Popov, V. Hurm, R. E. Makon, R. Driad, H. Walcher, J. Rosenzweig, Andreas-G. Steffan, G.G. Mekonnen, Heinz-Gunter Bach, Colja Schubert
  Setting the stage for 100GbE serial standard - the HECTO project,
  The World Telecommunications Congress 2010,SO7, Vienna, Austria, September 2010, September 13-14,2010,
• Holger Schmeckebier, Christian Meuer, Carsten Schmidt-Langhorst, Andrey Galperin, Colja Schubert, Dieter Bimberg
  Quantum Dot Semiconductor Optical Amplifier for All Optical Communication Networks at 1.3 um,
  European Semiconductor Laser Workshop (ESLW), Pavia,Italy, September 2010, September 24-25,2010,Pavia (Italy)
• Markus Nölle, Ronald Freund, Jonas Hilt, Lutz Molle, Matthias Seimetz
  8×224 Gbit/s PDM 16QAM WDM Transmission with Real-Time Signal Processing at the Transmitter,
  ECOC 2010, Turin (I) , September 2010
• Reinhold Ludwig, Heinz-Gunter Bach, Johannes Fischer, Reinhard Kunkel, C.C. Leonhardt, A. Matiss, Lutz Molle, Colja Schubert, A. Umbach
  Performance of a Novel Integrated Coherent Receiver Module for 100G Ethernet Applications and Beyond,
  Proc. 36th European Conference on Optical Communication (ECOC 2010), Turin (Italy), September 2010, Mo.2.F.1, Invited Paper, invited,September 19-23,2010,paper Mo.2.F.1
• Holger Schmeckebier, Dieter Bimberg, Andrey Galperin, Christian Meuer, Carsten Schmidt-Langhorst, Colja Schubert
  Quantum Dot Semiconductor Optical Amplifiers at 1.3 µm for Applications in All-Optical Communication Networks,
  Semicond. Sci. Technol. 26 (2011), Pavia (I) , September 2010
• Thomas Richter, Johannes Fischer, Tomoyuki Kato, Reinhold Ludwig, Ryo Okabe, Colja Schubert, Shigeki Watanabe
  All-Optical Level Equalization of Data Packets Using a Fiber-Optic Parametric Amplifier,
  Proc. 36th European Conference on Optical Communication (ECOC), Turin (Italy), September 2010, We.8.A.7, September 19-23
• Holger Schmeckebier, Christian Meuer, Dieter Bimberg, Carsten Schmidt-Langhorst, Andrey Galperin, Colja Schubert
  Quantum Dot Semiconductor Optical Amplifier for All-Optical Communication Networks at 1.3 um,
  International Nano-Optoelectronic Workshop (iNOW), Beijing and Changchun,China, August 2010, August 01-15,2010,Beijing and Changchun (China)
• Jonas Hilt, Ronald Freund, Lutz Molle, Markus Nölle, Matthias Seimetz
  32 Gbaud Real-Time FPGA-Based Multi-Format Transmitter for Generation of Higher-Order Modulation Formats,
  9th Conference on Optcial Internet,The Shilla Jeju, Jeju-do, Südkorea, July 2010, TuC1-4
• Thomas Richter, Robert Elschner, Lutz Molle, Klaus Petermann, Colja Schubert
  Coherent receiver-based compensation of phase distortions induced by single-pump HNLF-based FWM wavelength converters,
  Photonics in Switching, Monterey,California,(USA), July 2010, PWB2, July 25-28,Monterey,California,(USA),paper PWB2
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Carsten Schmidt-Langhorst, C.C. Leonhardt, A. Matiss, Colja Schubert
  Digital Coherent Receiver with Optical Sampling,
  Workshop der ITG-Fachgruppe 5.3.1 "Modellierung photonischer Komponenten und Systeme", Munich, Germany, June 2010, 10.-11. Juni 2010,
• Ronald Freund, Jonas Hilt, Markus Nölle, Lutz Molle, Matthias Seimetz, Johannes Fischer, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert
  High Spectral Efficient Phase and Quadrature Amplitude Modulation for Optical Fibre Transmission ,
  Signal Processing in Photonic Communications (SPPCom), Karlsruhe,Germany, June 2010, SPTuA2, Invited Paper, invited,21-24 Juni,Karlsruhe,Germany,paper SPTuA2
• Jonas Hilt, Markus Nölle, Lutz Molle, Matthias Seimetz, Ronald Freund
  32 Gbaud Real-Time FPGA-Based Multi-Format Transmitter for Generation of Higher-Order Modulation Formats,
  Workshop der ITG-Fachgruppe 5.3.1 "Modellierung photonischer Komponenten und Systeme", Munich, Germany, June 2010, 10.-11. Juni 2010
• Ronald Freund, G. Bosco, A. Carena, Hans Christian, A.D. Ellis, P. Frascella, W. Freude, Michael Galili, F.C.G. Gunning, David Hillerkuss, S.K. Ibrahim, Jürg Leuthold, Reinhold Ludwig, N. Mac Suibhne, Hansen Mulvad, Markus Nölle, L.K. Oxenløwe, P. Poggiolini, Carsten Schmidt-Langhorst, R. Schmogrow, Colja Schubert, M. Winter, J. Zhao
  Single- and Multi-Carrier Techniques to build up Tb/s per channel Transmission Systems,
  ICTON 2010, München (DE) , June 2010, Invited Paper, invited
• Agnieszka Konczykowska, Filipe Jorge, J.-Y. Dupuy, Muriel Riet, J. Godin, Andre Scavennec, Heinz-Gunter Bach, G.G. Mekonnen, Detlef Pech, Colja Schubert
  InP HBT demultiplexing ICs for over 100 Gb/s optical transmission,
  4th Microwave and Radar Week MRW-2010, Vilnius,Lithuania, June 2010, 14-18 June 2010
• Carsten Schmidt-Langhorst, Reinhold Ludwig, Lutz Molle, D.-D. Groß, Ronald Freund, Colja Schubert
  Terabit/s Single-Carrier Transmission Based on Coherent Time-Division Demultiplexing,
  Proc 11. ITG-Fachtagung Photonische Netze, Leipzig (DE), May 2010, May 3-4,2010,Leipzig (DE)
• Colja Schubert, R. E. Makon, Andreas-G. Steffan, R. Driad, Heinz-Gunter Bach, G.G. Mekonnen, R. Zhang, Reinhold Ludwig, Carsten Schmidt-Langhorst
  InP-basierte elektrische und elektro-optische Komponenten für 112 Gbit/s OOK Systeme,
  Proc 11. ITG-Fachtagung Photonische Netze, Leipzig (DE), May 2010, 26, May 3-4,2010,Leipzig (DE),paper 26
• Matthias Seimetz, Ronald Freund, Lutz Molle, Markus Nölle, Jonas Hilt, Dirk-Daniel Gross
  Spectrally Efficient Fiber Transmission Using Higher-Order Modulation Formats,
  FORCE Inaugural Workshop,Chalmers University of Technology, Gothenburg,Sweden, May 2010
• Markus Nölle
  Steigerung der Datenrate in optischen Systemen mit hoher spektraler Effizienz,
  ITG Fachtagung Photonische Netze 2010, Leipzig,Germany, May 2010
• Carsten Schmidt-Langhorst, Reinhold Ludwig, Lutz Molle, D.-D. Groß, Ronald Freund, Colja Schubert
  Terabit/s on a Single Wavelength Channel: Generation,Transmission and Coherent Detection,
  Proc. Optical Fiber Communication Conference (OFC 2010), San Diego,California (USA), March 2010, OThV3, Invited Paper, invited,21-25 March 2010,San Diego,California (USA),invited paper OThV3
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Carsten Schmidt-Langhorst, Andrey Galperin, Thomas Richter, C.C. Leonhardt, A. Matiss, Colja Schubert
  High-speed digital coherent receiver with parallel optical sampling,
  Proc. Optical Fiber Communication Conference (OFC 2010), San Diego,California (USA), March 2010, PDPB4, postdeadline,21-25 March 2010,San Diego,California (USA),post-deadline paper PDPB4
• A. Matiss, Reinhold Ludwig, Johannes Fischer, Lutz Molle, Colja Schubert, C.C. Leonhardt, Heinz-Gunter Bach, Reinhard Kunkel, A. Umbach
  Novel Integrated Coherent Receiver Module for 100G Serial Transmission,
  Proc. Optical Fiber Communication Conference (OFC 2010), San Diego,California (USA), March 2010, PDPB3, postdeadline,21-25 March 2010,San Diego,California (USA),post-deadline paper PDPB3
• Markus Nölle, Ronald Freund, Dirk-Daniel Gross, Lutz Molle
  Transmission of 5x62 Gbit/s DWDM Coherent OFDM with a Spectral Efficiency of 7.2 Bit/s/Hz using Joint 64-QAM and 16-QAM Modulation,
  OFC 2010, San Diego, CA (US) , March 2010

2009

• Ronald Freund, Matthias Seimetz, Lutz Molle, Tigran Baghdasaryan, Marco Forzati, Jonas Mårtensson
  Next generation optical networks based on higher-order modulation formats,coherent receivers and electronic distortion equalization,
  Proc. 3rd International Conference on Transparent Optical Networks (ICTON 2009), Angers,France, December 2009, Invited Paper, invited,10-12 December 2009,Angers,France
• Jonas Hilt, Matthias Seimetz, Lutz Molle, Ronald Freund
  High-Speed FPGA Implementation of Feed-Forward Phase Estimation Algorithms,
  Workshop der ITG Fachgruppe 5.3.1,Modellierung photonischer Komponenten und Systeme, Berlin,Germany, November 2009, 12-13 November 2009
• Hanyi Zhang, Carsten Schmidt-Langhorst, W. Zhao, Colja Schubert
  Mitigation of Sampling Clock Drift in Asynchronously Under-Sampled Optical Bit Pattern Monitoring,
  Asia Communications and Photonics Conference and Exhibition (ACP 2009), Shanghai,China, November 2009, TuE6, Asia Communications and Photonics Conference and Exhibition (ACP),Nov. 2-6,2009,Shanghai (China),paper TuE6; Proc. SPIE 7632,763205 (2009)
• W. Sohler, D. Büchter, L. Gui, H. Herrmann, H. Hu, Reinhold Ludwig, R. Nouroozi, V. Quiring, R. Ricken, Colja Schubert, H. Suche
  Wavelength Conversion and Optical Signal Processing in PPLN Waveguides,
  Asia Communications and Photonics Conference and Exhibition (ACP), Shanghai,China, November 2009, ThN1, Invited Paper, invited, Nov. 2-6,2009
• Markus Nölle, Dirk-Daniel Gross, Lutz Molle, Ronald Freund
  WDM Performance of Spectral Efficient Coherent OFDM,
  Workshop der ITG Fachgruppe 5.3.1,Modellierung photonischer Komponenten und Systeme, Berlin,Germany, November 2009, 12-13 November 2009
• A. Hachmeister, Ronald Freund, Michael Rohde
  Long Haul WDM Transmission of Optical Minimum Shift Keying Format with Narrow Channel Spacing,
  Proc. Asia Communications and Photonics Conference and Exhibition (ACCP 2009), Shanghai,China, November 2009, ,2-6 November 2009,Shanghai,China
• Carsten Schmidt-Langhorst, Christian Meuer, Reinhold Ludwig, D. Puris, René Bonk, T. Vallaitis, Dieter Bimberg, Klaus Petermann, Jürg Leuthold, Colja Schubert
  Quantum-Dot Semiconductor Optical Booster Amplifier with Ultrafast Gain Recovery for Pattern-Effect Free Amplification of 80 Gb/s RZ-OOK Data Signals,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, We6.2.1, September 20-24,2009,Vienna (AT),paper We6.2.1
• Robert Elschner, Thomas Richter, Klaus Petermann
  Impact of pump-phase modulation on fibre-based parametric wavelength conversion of coherently detected PSK signals,
  International Conference on Photonics in Switching (PiS), Pisa,Italy, September 2009, FrI1-5, September 15-19,2009,Pisa (Italy),paper FrI1-5
• Lutz Molle, Matthias Seimetz, Dirk-Daniel Gross, Ronald Freund, Michael Rohde
  Polarization Multiplexed 20 Gbaud Square 16QAM Long-Haul Transmission over 1120 km using EDFA Amplification,
  in Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna(AT), September 2009, number 8.4.4,September 20-24,2009,Vienna (AT)
• Heinz-Gunter Bach, Reinhard Kunkel, G.G. Mekonnen, R. Zhang, Ariane Sigmund, Daniel Schmidt, C. Sakkas, Detlef Pech, Colja Schubert
  Novel 107 Gb/s Bias-Feeding Photodetector OEIC for Efficient Low-Cost Photoreceiver Co-Packaging,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, PD1.8, postdeadline,September 20-24,2009,Vienna (AT),postdeadline paper PD1.8
• Thomas Richter, Robert Elschner, Colja Schubert, Klaus Petermann
  Fibre-based parametric wavelength conversion of 86 Gb/s RZ-DQPSK signals with 15 dB gain using a dual-pump configuration,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, 3.3.2, September 20-24,2009,Vienna (AT),paper 3.3.2
• F. Futami, Ryo Okabe, Tomoyuki Kato, Carsten Schmidt-Langhorst, Colja Schubert, Reinhold Ludwig, Shigeki Watanabe
  All-optical Combination of DPSK and OOK to 320-Gb/s DQPSK Signal Using Fiber-based Signal Processors,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, Tu4.3.1, September 20-24,2009,Vienna (AT),Tu4.3.1
• G. Gavioli, E. Torrengo, G. Bosco, A. Carena, V. Curri, V. Miot, P. Poggiolini, M. Belmonte, A. Guglierame, A. Brinciotti, A. La Porta, F. Forghieri, C. Muzio, G. Osnago, S. Piciaccia, C. Lezzi, Lutz Molle, Ronald Freund
  100Gb/s WDM NRZ-PM-QPSK Long-Haul Transmission Experiment over Installed Fiber Probing Non-Linear Reach With and Without DCUs,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, September 20-24,2009,Vienna (AT)
• G.G. Mekonnen, Heinz-Gunter Bach, Filipe Jorge, Agnieszka Konczykowska, Reinhard Kunkel, Detlef Pech, Muriel Riet, Thomas Rosin, Andre Scavennec, Colja Schubert
  Hybrid Co-Packaged Receiver Module with pin-Photodiode Chip and DEMUX-IC for 107 Gb/s Data Rates,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, Th9.2.6, September 20-24,2009,Vienna (AT),Th9.2.6
• Reinhold Ludwig, Heinz-Gunter Bach, Reinhard Kunkel, C.C. Leonhardt, A. Matiss, Lutz Molle, Daniel Schmidt
  Coherent Detection of a 50 Gb/s QPSK Signal Using an InP 90° HybridMonolithically Integrated with Balanced Photodetectors,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, P3.20, September 20-24,2009,Vienna (AT),paper P3.20
• M.L. Nielsen, A. Boutin, L. Fulop, Reinhold Ludwig, Andreas-G. Steffan, G. Tsianos, A. Umbach, G. Unterbörsch, F. Verluise
  Investigation of DGD and Delay-Line Interferometer Phase Tolerance of Integrated Receiver Module for 86 Gb/s NRZ-DQPSK modulation,
  Proc. 35th European Conference on Optical Communication (ECOC 2009), Vienna (AT), September 2009, Th9.2.7, September 20-24,2009,Vienna (AT),Th9.2.7
• Carsten Schmidt-Langhorst
  Future Trends in Fiber-Optic Communication Networks,
  International Nano-Optoelectronic Workshop (iNOW), Stockholm, August 2009, Invited Paper, 04.08.2009,Stockholm,invited speaker
• Ronald Freund, H. Louchet, Marko Gruner, Lutz Molle, Matthias Seimetz, A. Richter
  80 Gbit/s/Channel Polarization Multiplexed Star-16QAM WDM Transmission over 720 km SSMF with Electronic Distortion Equalization,
  Proc. 14th Opto Electronics and Communications Conference (OECC 2009), Hongkong,China, July 2009
• Ronald Freund, D.-D. Groß, Reinhold Ludwig, Carsten Schmidt-Langhorst
  1.28 Tb/s Single Wavelength Star-16-QAM Transmission over up to 800 m of Graded-Index Multimode Fibre,
  Proc. 14th OptoElectronics and Communications Conference (OECC 2009), Hong Kong (China), July 2009, ThPD7, postdeadline,13-17 July 2009,Hong Kong (China),postdeadline paper ThPD7
• Josep-M. Fàbrega, Josep Prat, Lutz Molle, Ronald Freund
  Design of a wavelength control for coherent detection of high order modulation formats,
  submitted to Proc. International Conference on Transparent Optical Networks - ICTON 2009, Island of São Miguel,Azores,Portugal, June 2009, WEP21, June 28 - July 2,2009 - Island of São Miguel,Azores,Portugal,paper WEP21
• Carsten Schmidt-Langhorst, Reinhold Ludwig, H. Hu, Colja Schubert
  1 Tb/s Transmission on a Single Wavelength Channel,
  Proc 10. ITG-Fachtagung Photonische Netze , Leipzig,Germany, May 2009, May 4-5,2009,Leipzig (DE)
• Carsten Schmidt-Langhorst, Reinhold Ludwig, H. Hu, Colja Schubert
  Single-Channel 1-Tb/s Transmission over 480 km DMF for Future Terabit Ethernet Systems,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OTuN5, 22-26 March 2009,San Diego,California (USA),paper OTuN5
• Ronald Freund
  High-speed transmission in multimode fibres,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, 22-26 March 2009,San Diego,California (USA),Tutorial
• Heinz-Gunter Bach, Giorgis Gebre Mekonnen, Reinhard Kunkel, Colja Schubert, Detlef Pech, Thomas Rosin, Agnieszka Konczykowska, Filipe Jorge, Andre Scavennec, Muriel Riet
  107 Gbit/s Demultiplexing Photoreceivers Comprising pin and pinTWA Frontends,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OMK2, 22-26 March 2009,San Diego,California (USA),paper OMK2
• Carsten Schmidt-Langhorst, Reinhold Ludwig, D.-D. Groß, Lutz Molle, Matthias Seimetz, Ronald Freund, Colja Schubert
  Generation and Coherent Time-Division Demultiplexing of up to 5.1 Tb/s Single-Channel 8-PSK and 16-QAM Signals,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, PDPC6, postdeadline,22-26 March 2009,San Diego,California (USA),post-deadine paper PDPC6
• Colja Schubert, R.E. Makon, Andreas-G. Steffan, R. Driad, Reinhold Ludwig, Carsten Schmidt-Langhorst
  Characterization of an InP-based Electrical 1:2 Demultiplexer in a 107 Gb/s OOK System,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OThE3, 22-26 March 2009,San Diego,California (USA),paper OThE3
• H. Hu, H. Suche, Reinhold Ludwig, B. Huettl, Carsten Schmidt-Langhorst, R. Nouroozi, W. Sohler, Colja Schubert
  Polarization insensitive all-optical wavelength conversion of 320 Gb/s RZ-DQPSK signals,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OThS6, 22-26 March 2009,San Diego,California (USA),paper OThS6
• M. Kroh, G. Unterbörsch, G. Tsianos, R. Ziegler, Andreas-G. Steffan, Heinz-Gunter Bach, J. Kreissl, Reinhard Kunkel, G.G. Mekonnen, Wolfgang Rehbein, Daniel Schmidt, Reinhold Ludwig, Klaus Petermann, J. Bruns, T. Mitze, K. Voigt, Lars Zimmermann
  Hybrid Integrated 40 Gb/s DPSK Receiver on SOI,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OMK3, 22-26 March 2009,San Diego,California (USA),paper OMK3
• Matthias Seimetz
  System Degradation by the SPM-Induced Mean Nonlinear Phase Shift in Optical QAM Transmission,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, JWA38, 22-26 March 2009,San Diego,California (USA),paper JWA38
• Matthias Seimetz, Lutz Molle, Marko Gruner, D.-D. Groß, Ronald Freund
  Transmission Reach Attainable for Single-Polarization and PolMux Coherent Star 16QAM Systems in Comparison to 8PSK and QPSK at 10Gbaud,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, OTuN2, 22-26 March 2009,San Diego,California (USA),paper OTuN2
• Matthias Seimetz, Markus Nölle, Carl-M. Weinert, Ronald Freund, Bernhard Spinnler, S. Spälter, C. R. S. Fludger
  Influence of Neighbor Channel Modulation Formats on 112 Gbit/s and 42.8 Gbit/s WDM Coherent Polmux-QPSK Transmission Systems,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, JThA44, 22-26 March 2009,San Diego,California (USA),paper JThA44
• Markus Nölle, Ronald Freund
  Comparison of 30 Gbit/s Coherent 8PSK Single Carrier and OFDM Multi Carrier Systems with Respect to Transmission Reach,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2009, JTHA43, 22-26 March 2009,San Diego,California (USA),paper JTHA43

2008

• L. Han, H. Hu, Reinhold Ludwig, Colja Schubert, Hanyi Zhang
  All-Optical Wavelength Conversion of 80 Gb/s RZ-DQPSK Using Four-Wave Mixing in a Semiconductor Optical Amplifier,
  21th Annual Lasers and Electro Optics Society Meeting (LEOS 2008), Newport Beach,CA,USA, November 2008, 9 - 13 November 2008,Newport Beach,CA,USA,paper MP4
• Colja Schubert, Reinhold Ludwig, B. Huettl, Ronald Kaiser, H. Hu, Andreas-G. Steffan, Carsten Schmidt-Langhorst
  53.5 GHz Monolithically Integrated Pulse Source for 107 Gb/s RZ-DQPSK Transmission,
  Proc. 34th European Conference on Optical Communication (ECOC 2008), Brussels,Belgien, September 2008, Tu.3.D.3, September 21-25,2008,Brussels (BE),paper Tu.3.D.3
• Christoph Caspar, Ronald Freund, F. Achten, A. Gholami, Gerard Kuyt, Pieter Matthijsse, Denis Molin
  Impact of transceiver characteristics on the performance of 10 GbE links applying OM-4 multimode fibers,
  Proc. 57th IWCS Conference 2008, Providence Rhode Island,USA, September 2008, November 9 - 11,2008,Providence Rhode Island,USA
• B. Huettl, H. Hu, Reinhold Ludwig, Ronald Kaiser, Carsten Schmidt-Langhorst, Andreas-G. Steffan, Colja Schubert
  Linewidth Investigation of Monolithically Integrated 40 GHz Mode-Locked Laser Diodes for High-Speed RZ-DQPSK Transmission,
  Proc. 34th European Conference on Optical Communication (ECOC 2008), Brussels,Belgien, September 2008, Th.1.C.7, September 16-20,2008,Brussels (BE),paper Th.1.C.7
• G.G. Mekonnen, B. Hüttl, Heinz-Gunter Bach, Detlef Pech, Thomas Rosin, Colja Schubert, Agnieszka Konczykowska, Filipe Jorge, Muriel Riet
  InP Waveguide-integrated pin-Photodiode Hybrid Packaged with an HBT-DEMUX-Chip for Receiver Modules of 80-100 Gb/s Data Rates,
  Proc. 34th European Conference on Optical Communication (ECOC 2008), Brussels,Belgien, September 2008, September 21-25,2008,Brussels (BE),paper We.1.C.5
• K. Voigt, Lars Zimmermann, G. Winzer, Klaus Petermann, Carl-M. Weinert
  Silicon-on-insulator 90° optical hybrid using 4x4 waveguide couplers with C-band operation,
  Proc. 34th European Conference on Optical Communication (ECOC 2008), Brussels (BE), September 2008, Tu.3.C.5, September 16-20,2008,Brussels (BE),paper Tu.3.C.5
• H. Hu, L. Han, Reinhold Ludwig, Carsten Schmidt-Langhorst, J. Yu, Colja Schubert
  107 Gb/s RZ-DQPSK Signal Transmission over 108 km SMF Using Optical Phase Conjugation in an SOA,
  Proc. Optical Fiber Communication Conference (OFC 2009), San Diego,California (USA), March 2008, OThF6, 22-26 March 2009,San Diego,California (USA),paper OThF6
• Lutz Molle, Ronald Freund, W. Wong, Jörg Schwartz
  Wavelength Dependent Performance of 20 Gbit/s RZ-DPSK for Upgrades of Non-Slope-Matched Submarine Transmission Systems ,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, JWA51, 24-28 February 2008,San Diego,California (USA),paper JWA51
• Ronald Freund, D.-D. Groß, Matthias Seimetz, Lutz Molle, Christoph Caspar
  30 Gbit/s RZ-8-PSK Transmission over 2800 km Standard Single Mode Fibre without Inline Dispersion Compensation,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, OMI5, 24-28 February 2008,San Diego,California (USA),paper OMI5
• Reinhold Ludwig, B. Huettl, H. Hu, Carsten Schmidt-Langhorst, Colja Schubert
  107 Gb/s RZ-DPSK Transmission over 320 km,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, OWJ6, 24-28 February, 2008paper OWJ6
• K. Cvecek, K. Sponsel, C. Stephan, G. Onishchukov, Reinhold Ludwig, Colja Schubert, B. Schmauss, G. Leuchs
  Phase-Preserving 2R Regeneration of a WDM RZ-DPSK Signal Using a Nonlinear Amplifying Loop Mirror,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, OWS3, 24-28 February 2008,San Diego,California (USA),paper OWS3
• Reinhold Ludwig, F. Futami, B. Huettl, Carsten Schmidt-Langhorst, Ryo Okabe, Shigeki Watanabe, Colja Schubert
  All-optical Amplitude Noise Suppression of 107 Gb/s DPSK,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, OWS5, 24-28 February 2008,San Diego,California (USA),paper OWS5
• Matthias Seimetz
  Laser Linewidth Limitations for Optical Systems with High-Order Modulation Employing Feed Forward Digital Carrier Phase Estimation,
  Proc. Optical Fiber Communication Conference (OFC 2008), San Diego,California (USA), February 2008, OTuM2, 24-28 February 2008,San Diego,California (USA),paper OTuM2

2007

• Ronald Kaiser, B. Hüttl, Wolfgang Rehbein, S. Fidorra, Colja Schubert, H. Heidrich
  40 GHz monolithically integrated semiconductor mode-locked laser based on InP for application in high speed transmission systems,
  Workshop "Nonlinear Dynamics in Semiconductor Lasers", Weierstraß Institute Berlin, Berlin,Germany, November 2007, Invited Paper, invited talk,November 19 - 21,2007
• Colja Schubert
  The Dawn of the Terabit Era:Technology and Challenges of Terabit Systems,
  Nature Photonics Technology Conference on Optical Communications 2007, Tokyo,Japan, October 2007, Invited Paper, October 23-25,2007,Tokyo (JP),invited talk
• Reinhold Ludwig, Colja Schubert, B. Huettl, Carsten Schmidt-Langhorst, R.H. Derksen, Michael Möller
  100 Gb/s ETDM Receivers,
  Proc. 20th Annual Meeting of the IEEE Lasers and Electro-Optics Society (LEOS Annual), Lake Buena Vista (USA), IEEE, October 2007, Invited Paper, invited,October 21-25,2007,Lake Buena Vista (USA),invited paper
• R.H. Derksen, Michael Möller, Colja Schubert
  100-Gbit/s full-ETDM transmission technologies,
  Proc. 29th IEEE Compound Semiconductor IC Symposium (CSICS), Portland (USA), IEEE, October 2007, G.2, October 14-17,2007,paper G.2
• Ronald Kaiser, B. Hüttl, Wolfgang Rehbein, S. Fidorra, Andreas-G. Steffan
  Monolithic Mode-Locked 40/43/53 GHz MQW DBR Lasers for Applications of Phase Encoding Modulation Formats,
  European Semiconductor Laser Workshop (ESLW), Berlin,Germany, September 2007, Invited Paper, September 14-15,2007,Berlin (DE),invited talk
• Colja Schubert
  High Speed Transmission Beyond 40 Gbit/s,
  2nd Sino-German Symposium on Optical CommunicationNetworks (SOCN), Berlin,Germany, September 2007, We14, Invited Paper, September 11-16,2007,Berlin (DE),invited paper We14
• Robert Elschner, Lutz Molle, Klaus Petermann, Thomas Richter, Colja Schubert
  Single-Pump FWM-Wavelength Conversion in HNLF using Coherent Receiver-based Electronic Compensation,
  Proc. 36th European Conference on Optical Communication (ECOC), Turin (Italy), September 2007, September 19-23,2010,Turin (Italy) P3.17
• Reinhold Ludwig, S. Weisser, Carsten Schmidt-Langhorst, L. Raddatz, Colja Schubert
  Unrepeatered transmission of of 160 Gb/s RZ-DPSK over 240 km Dispersion Managed Fiber,
  Proc. 33rd European Conference on Optical Communication (ECOC), Berlin,Germany, September 2007, 2.3.2, September 16-20,2007,Berlin (DE),paper 2.3.2
• Lars Zimmermann, K. Voigt, G. Winzer, T. Mitze, J. Bruns, Klaus Petermann, Thomas Richter, Colja Schubert
  Silicon-on-Insulator (SOI) Delay-Line Interferometer with Low Polarization-Dependent Frequency Shift for 40 Gbit/s DPSK Demodulation,
  Proc. 33rd European Conference on Optical Communication (ECOC), Berlin,Germany, September 2007, 7.3.4, September 16-20,2007,Berlin (DE),paper 7.3.4
• Thomas Richter, Robert Elschner, Klaus Petermann, Colja Schubert
  Tolerances of Counterphased Pump-Phase Modulation in a Fibre-Based Dual-Pump Wavelength Converter for 86 Gb/s RZ-DQPSK,
  International Conference on Photonics in Switching (PiS), Pisa,Italy, September 2007, FrI1-3, September 15-19,2009,Pisa (Italy),paper FrI1-3
• B. Hüttl
  320 Gbit/s DQPSK All-Optical Wavelength Conversion based on Four-Wave Mixing in Highly Nonlinear Fibers,
  2nd Sino-German Symposium on Optical CommunicationNetworks (SOCN), Berlin,Germany, September 2007, Fr2, September 11-16,2007,talk Fr2
• A. Demircan, U. Bandelow, B. Hüttl, M. Kroh
  Generation of new Frequencies by Pulse Splitting,
  Proc. 33rd European Conference on Optical Communication (ECOC), Berlin,Germany, September 2007, September 16-20,2007,poster P023
• Leonardo-D. Coelho, Christoph Caspar, Ronald Freund, Dirk-Daniel Gross, Norbert Hanik, Lutz Molle, Ernst-Dieter Schmidt
  Numerical and Experimental Investigation of the Effect of Dispersion on Nonlinear Phase Noise in RZ-DPSK,
  ECOC 2007, Berlin (DE) , September 2007
• Reinhold Ludwig
  Transmission Systems Beyond 1 Tbit/s: Status and Technologies,
  Proc. 3rd International Symposium on Ultrafast Photonic Technologies (ISUPT),Massachusetts Institute of Technology, Boston (USA), August 2007, August 20-21,2007,Massachusetts Institute of Technology
• Ronald Kaiser, B. Huettl
  Monolithic Mode-Locked 40 GHz DBR Laser Modules für High-Speed Transmission Systems Utilizing Phase Modulation Formats,
  Proc. 9th Intern. Conf. on Transparent Optical Networks (ICTON 2007), Rome,Italy, July 2007, Invited Paper, invited,July 1–5 (2007),Rome (IT),invited paper
• Reinhold Ludwig, Carsten Schmidt-Langhorst, B. Huettl, Colja Schubert, S. Weisser, L. Raddatz
  Transmission Systems beyond 100 Gbit/s: Status and Technologies,
  2007 Digest of the LEOS Summer Topical Meetings, Portland (USA), pp. 228-229, July 2007, ME3.2, Invited Paper, invited,23-25 July 2007,paper ME3.2 (invited)
• S. Weisser, Colja Schubert, Reinhold Ludwig, W. Müller, L. Raddatz, O. Wohlgemuth
  85.2 Gbit/s NRZ-DQPSK DWDM Transmission over 2000 km Non-Zero Dispersion Shifted Fiber,
  Proc. 12th Optoelectronics and Communications Conference / 16th International Conference on Integrated Optics and Optical Fiber Communication (OECC/IOOC 2007), Yokohama (JP), July 2007, PD1-3, July 9-13,2007,Yokohama (JP),postdeadline paper PD1-3
• A. Umbach, G. Unterbörsch, Heinz-Gunter Bach, Colja Schubert, R.H. Derksen, J.H. Sinsky
  Photoreceivers for 100 Gbit/s Applications,
  2007 Digest of the LEOS Summer Topical Meetings, Portland (USA), July 2007, Invited Paper, invited,invited paper,July 23-25,2007,
• Reinhold Ludwig, S. Weisser, Carsten Schmidt-Langhorst, L. Raddatz, Colja Schubert
  Unrepeatered Transmission of 160 Gb/s RZ-DPSK over 293 km Dispersion Managed Fiber using Optimized Raman Amplification and Advanced Forward-Error-Correction,
  Proc. 12th Optoelectronics and Communications Conference / 16th International Conference on Integrated Optics and Optical Fiber Communication (OECC/IOOC 2007), Yokohama,Japan, July 2007, July 9-13,2007,Yokohama (JP),postdeadline paper PD1-4
• Carsten Schmidt-Langhorst
  Terabit-Übertragung auf einem einzelnen Wellenlängenkanal,
  Kolloquium Optische Nachrichtentechnik,TU Wien, Wien (Österreich), June 2007, TU Wien (Österreich),14.06.2007
• Ronald Freund
  Upgrade von optischen Unterwasser-Übertragungssystemen mit höheren Datenraten und neuen Modulationsverfahren,
  Kolloquium TU Kiel, Kiel (DE), June 2007, ,11.06.2007,Kiel (DE)
• Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, B. Hüttl, Hans-Georg Weber
  Ultrafast Optical Transmission Technologies,
  Proc. Conference on Lasers and Electro-Optics / International Quantum Electronics Conference (CLEO Europe / IQEC), Munich,Germany, June 2007, Invited Paper, invited,June 17-22,2007,Munich (DE),invited paper
• Colja Schubert, Reinhold Ludwig, Carsten Schmidt-Langhorst, S. Weisser, L. Raddatz
  160 Gbit/s RZ-DPSK OTDM Übertragung über 480 km mit 160 km Repeaterabstand,
  Proc. 8. ITG-Fachtagung Photonische Netze, Leipzig (DE), May 2007, May 7-8,2007,Leipzig (DE)
• Ronald Freund, Stuart Barnes, Christoph Caspar, Lutz Molle, Jörg Schwartz, S. Webb
  Higher Bitrates and Advanced Modulation Formats Facilitate Overlay Upgrades of Installed Submarine Systems,
  8. ITG-Fachtagung Photonische Netze, Leipzig (DE) , May 2007
• R.H. Derksen, Colja Schubert, S.L. Jansen, X. Zhou, M. Birk
  Field trial on 107 Gbit/s transmission with pure electrical time-division multiplex over 160 km ,
  Proc 8. ITG-Fachtagung Photonische Netze, Leipzig (DE), May 2007, May 7-8,2007,Leipzig (DE)
• B. Huettl, Alexandre Gual i Coca, H. Suche, Reinhold Ludwig, Carsten Schmidt-Langhorst, Hans-Georg Weber, W. Sohler, Colja Schubert
  320 Gbit/s DQPSK All-Optical Wavelength Conversion using Periodically Poled LiNbO3,
  Proc. Conf. on Lasers and Electro-Optics / International Quantum Electronics (CLEO/QELS), Baltimore (USA), May 2007, CThF1, May 6-11,2007,Baltimore (USA),paper CThF1
• Jörg Schwartz, Stuart Barnes, Christoph Caspar, Ronald Freund, Lutz Molle, S. Webb
  Higher Bitrates and Advanced Modulation Formats Facilitate Overlay Upgrades of Installed Submarine Systems,
  SubOptic 2007, Baltimore, MD (US) , May 2007
• Colja Schubert, Reinhold Ludwig, B. Huettl, H. Hu, Carsten Schmidt-Langhorst
  107 Gbit/s RZ-DPSK Transmission using an,
  Proc 9. ITG-Fachtagung Photonische Netze 2007, Leipzig,Germany, April 2007, April 28-29,2007,Leipzig (DE)
• Johannes Fischer, Reinhold Ludwig, Lutz Molle, Carsten Schmidt-Langhorst, Andrey Galperin, Thomas Richter, C.C. Leonhardt, A. Matiss, Colja Schubert
  High-Speed Digital Coherent Receiver with Parallel Optical Sampling,
  Proc. Optical Fiber Communication Conference (OFC 2010), San Diego,California (USA), March 2007, PDPB4, post-deadline paper PDPB4
• Carsten Schmidt-Langhorst, Reinhold Ludwig, Michael Galili, B. Hüttl, F. Futami, Shigeki Watanabe, Colja Schubert
  Applications of Highly Nonlinear Fibers for 160 Gbit/s All-Optical Data Format Conversion,
  Workshop "Nonlinear Effects in Photonic Materials",Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin,Germany, March 2007, March 12-14,2007,Berlin (Germany)
• Lutz Molle, Christoph Caspar, S. Desbruslais, Ronald Freund, R. Oberland, Jörg Schwartz
  Upgrades of Non-Slope Matched Submarine Transmission Systems Using Differential Phase Shift Keying,
  Proc. Optical Fiber Communication Conference (OFC 2007), Anaheim, CA (US) , March 2007, OTuG4
• Alexandre Gual i Coca, B. Hüttl, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert
  320 Gbit/s All Optical Wavelength Conversion Using Periodically Poled Lithium Niobate ,
  Workshop "Nonlinear Effects in Photonic Materials",Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin,Germany, March 2007, March 12-14,2007
• B. Hüttl, Alexandre Gual i Coca, Michael Galili, Colja Schubert, Carsten Schmidt-Langhorst, Reinhold Ludwig, Hans-Georg Weber, Robert Elschner, C.-A. Bunge
  All Optical Wavelength Conversion by Four Wave Mixing in Highly Nonlinear Fibers for 160 Gbit/s Phase Modulated Signals,
  Workshop "Nonlinear Effects in Photonic Materials",Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin,Germany, March 2007, March 12-14,2007,Berlin (Germany)
• S.L. Jansen, M. Birk, Marc Bohn, Huug de Waardt, R.H. Derksen, F. Horst, G.D. Khoe, Andreas Kirstädter, P.M. Krummrich, Michael Möller, B.J. Offrein, Colja Schubert, D. van den Borne, Claus-Jörg Weiske, X. Zhou
  107-Gb/s Full -ETDM transmission over field installed fiber using vestigial sideband modulation,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007), Anaheim, CA (US) , March 2007, OWE3
• Gottfried Lehmann, R.H. Derksen, Colja Schubert, M. Winter
  100 Gigabit Ethernet Transmission - Physical Layer Issues,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007), Anaheim,CA,(USA), March 2007, OThD5, Invited Paper, invited,March 25-29,2007,Anaheim (USA),paper OThD5
• F. Futami, Reinhold Ludwig, Ryo Okabe, S. Ono, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  All-optical Amplitude Noise Suppression of Both 160-Gb/s OOK and DPSK Data Signals by Parametric Fiber Switch,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007), Anaheim,CA,(USA), March 2007, OThB3, March 25-29,2007,Anaheim (USA),paper OThB3
• Reinhold Ludwig, L. Raddatz, Carsten Schmidt-Langhorst, Colja Schubert, S. Weisser
  160 Gb/s DPSK OTDM-Transmission over 480 km using 160 km Repeater Spans and Advanced Forward-Error-Correction,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007), Anaheim,CA,(USA), March 2007, OWE4, March 25-29,2007,Anaheim (USA),paper OWE4
• Michael Galili, A. Gual, B. Hüttl, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert
  320 Gbit/s DQPSK All-Optical Wavelength Conversion using Four Wave Mixing,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007), Anaheim,CA,(USA), March 2007, OTuI3, March 25-29,2007,Anaheim (USA),paper OTuI3
• Michael Galili, F. Futami, B. Hüttl, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  All-Optical Combination of DPSK and OOK to 160 Gbit/s DQPSK Data Signals,
  Proc. Optical Fiber Communication Conference (OFC 2007) and National Fiber Optic Engineers Conference (NFOEC 2007, Anaheim,CA,(USA), March 2007, OThI5, March 25-29,2007,Anaheim (USA),paper OThI5

2006

• Colja Schubert, Sebastian Ferber, B. Huettl, Reinhold Ludwig, Carsten Schmidt-Langhorst, Hans-Georg Weber
  Single channel transmission beyond 1 Tbit/s,
  Proc. 19th Annual Meeting of the IEEE Lasers and Electro-Optics Society  (LEOS 2006),29 October - 2 November 2006,Montreal (Canada), Montreal (CA), IEEE, October 2006, ThX1, Invited Paper, invited
• Reinhold Ludwig, Sebastian Ferber, Colja Schubert, Carsten Schmidt-Langhorst, B. Huettl, Hans-Georg Weber
  Single Channel Transmission beyond 1 Tbit/s,
  Proc. Frontiers in Optics 2006 The 90th OSA Annual Meeting Laser Science XXII (OSA 2006), Rochester (USA), October 2006, FTuP5, Invited Paper, invited,8-12 October 2006,Rochester (USA),paper FTuP5
• Jörg Schwartz, Stuart Barnes, Christoph Caspar, Ronald Freund, Lutz Molle, S. Webb
  Upgrades of Submarine Systems using Higher Bitrates and Advanced Modulation Formats,
  Proc. Asia Optical Fiber Communication & Optoelectronic Exposition (AOE 2006), Shanghai (CN), pp. 126-128, October 2006
• Colja Schubert, R.H. Derksen, Sebastian Ferber, Reinhold Ludwig, Joachim Lutz, Michael Möller, Carsten Schmidt-Langhorst, Claus-Jörg Weiske
  107 Gbit/s Transmission Using An Integrated ETDM Receiver,
  Proc. 32nd European Conference on Optical Communications  (ECOC 2006), Cannes (France), pp. 33-34, September 2006, Tu1.5.5, 24-28 September 2006,Cannes (France) Vol. 2,pp. 33-34, paper Tu1.5.5
• Carsten Schmidt-Langhorst, F. Futami, Michael Galili, B. Huettl, Reinhold Ludwig, Colja Schubert, Shigeki Watanabe
  160 Gbit/s All-Optical OOK to DPSK In-Line Format Conversion,
  Proc. 32nd European Conference on Optical Communications  (ECOC 2006), Cannes (France), pp. 37-38, September 2006, Th4.3.5, postdeadline,24-28 September 2006,Cannes (France) Vol. 6,pp. 37-38,postdeadline paper Th4.3.5
• Reinhold Ludwig, Sebastian Ferber, B. Huettl, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  Ultrafast Transmission technology,
  Optical Transmission,Switching and Subsystems IV,Proc. of SPIE (APOC 2006), Gwangju, Korea (South), September 2006, Invited Paper, invited,Vol. 6353,paper 6353-81
• S. Weisser, Reinhold Ludwig, L. Raddatz, Colja Schubert
  2000 km DWDM Transmission of 85.2 Gbit/s DQPSK Data with 100 GHz Channel Spacing over Non-Zero Dispersion Shifted Fiber,
  Proc. 32nd European Conference on Optical Communications (ECOC 2006), Cannes (France), pp. 7-8, September 2006, Mo3.2.4, 24-28 September 2006,Cannes (France) Vol.1,pp. 7-8,paper Mo3.2.4
• Christian Meuer, Dieter Bimberg, Sebastian Ferber, Gerrit Fiol, A.R. Kovsh, M. Kuntz, M. Laemmlin, Nikolay Ledentsov, Colja Schubert, Andreas-G. Steffan, A. Umbach
  High Frequency Signal Amplification using Quantum Dot Semiconductor Optical Amplifiers at 1.3 µm,
  Proc. 32nd European Conference on Optical Communications  (ECOC 2006), Cannes (France), pp. 543-544, September 2006, We4.6.5, 24-28 September 2006,Cannes (France) Vol.3,pp. 543-544,paper We4.6.5
• S. Kiekbusch, E. Brinkmeyer, Sebastian Ferber, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  Automatic Compensation of PMD and Chromatic Dispersion in a 160 Gb/s Transmission Experiment,
  Proc. 32nd European Conference on Optical Communications  (ECOC 2006), Cannes (France), pp. 177-178, September 2006, Th3.5.1, 24-28 September 2006,Cannes (France) Vol.4,pp. 177-178,paper Th3.5.1
• Colja Schubert, Carsten Schmidt-Langhorst, Reinhold Ludwig, Sebastian Ferber, B. Huettl, Hans-Georg Weber
  Terabit Transmission on a Single Wavelength Channel,
  Proc. 11th European Conference on Networks & Optical Communications (NOC 2006), Berlin,Germany, pp. 105-108, July 2006, Invited Paper, invited, 10-13 July 2006,Berlin (Germany)
• Carsten Schmidt-Langhorst, M. Kroh, Sebastian Ferber, V. Marembert, Colja Schubert, Reinhold Ludwig, B. Hüttl, Hans-Georg Weber
  Generation and Transmission of Terabit/s Optical Data Signals,
  Workshop "Nonlinear Dynamics in Modelocked Lasers and Optical Fibers" by the Weierstrass Institute for Applied Analysis and Stochastics and the Humboldt University of Berlin,Institute of Physics, Berlin,Germany, July 2006, 13.-14.07.06
• Reinhold Ludwig, S. Feber, Colja Schubert, Carsten Schmidt-Langhorst, B. Huettl, Hans-Georg Weber
  Single Channel Transmission beyond 1 Tbit/s: Technology and Challenges,
  Proc. 11th OptoElectronics and Communications Conference (OECC 2006), Kaohsiung (Taiwan), July 2006, 4F2-1, Invited Paper, invited,3-7 July 2006,Kaohsiung (Taiwan),paper 4F2-1
• Reinhold Ludwig, Colja Schubert, S. Weisser, L. Raddatz
  5.4 Tbit/s (64*85.2) Gbit/s DQPSK Transmission with 100 GHz Channel Spacing over 2000 km Non-Zero Dispersion Shifted Fiber,
  Proc. 11th OptoElectronics and Communications Conference (OECC 2006), Kaohsiung (Taiwan), July 2006, postdeadline,3-7 July 2006,Kaohsiung (Taiwan), postdeadline paper
• Colja Schubert, Sebastian Ferber, Reinhold Ludwig, Carsten Schmidt-Langhorst, Hans-Georg Weber
  High-speed Transmission based on a 40 Gbaud DQPSK System,
  7. ITG Fachtagung Photonische Netze,ITG Fachbericht 193, Leipzig (Germany), pp. 45-49, April 2006, 27-28 April 2006
• Matthias Seimetz
  Performance of Coherent Optical Square-16-QAM-Systems based on IQ-Transmitters and Homodyne Receivers with Digital Phase Estimation,
  Proc. Fiber Optic Engineers Conf. (NFOEC 2006),Anaheim (USA), Anaheim,CA,(USA), April 2006, NWA4
• R.H. Derksen, Gottfried Lehmann, Claus-Jörg Weiske, Colja Schubert, Reinhold Ludwig, Sebastian Ferber, Carsten Schmidt-Langhorst, Joachim Lutz, Michael Möller
  Integrated 100 Gbit/s ETDM Receiver in a Transmission Experiment over 480 km DMF,
  Proc. Optical Fiber Communication Conference and National Fiber Optic Engineers Conference (OFC/NFOEC 2006), Anaheim,CA,(USA), March 2006, postdeadline
• Sven Bauer, M. Biletzke, C. Castar, H. Ding, Ronald Freund, J. Kreissl, Lutz Molle, B. Sartorius
  Compact RZ-DPSK Transmitter Applying a PhaseCOMB Laser as Carved Source,
  Proc. Optical Fiber Communication Conference (OFC 2006),Anaheim (USA), Anaheim,CA,(USA), March 2006, doi: 10.1109/OFC.2006.215720, OThG6
• V. Marembert, Sebastian Ferber, M. Kroh, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  Investigation of fiber based gates for time division demultiplexing up to 640 Gbit/s,
  Proc. 2006 Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, Anaheim,CA,(USA), March 2006, OWI12, 5-10 March 2006, paper OWI12
• M. Kroh, Sebastian Ferber, Reinhold Ludwig, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  Transmitter enabling Ultra-High-Speed Transmission of Phase Modulated Data Signals up to 640,
  2006 Optical Fiber Communication Conference and National Fiber Optic Engineers Conference,5-10 March 2006, Anaheim,CA,(USA), March 2006, OWW1, Invited Paper, invited,5-10 March 2006, paper OWW1
• Reinhold Ludwig
  Ultrafast Transmission Technology,
  International Symposium on Photonics and Advanced Networks (ISPAN 2006), Tokyo,Japan, January 2006, Invited Paper, invited,10 January 2006,Tokyo (Japan)
• Reinhold Ludwig, Sebastian Ferber, M. Kroh, V. Marembert, C. Schmidt, Colja Schubert, Hans-Georg Weber
  All Optical Signal Processing Technologies and Their Applications,
  Proc. Ninth International Symposium on Contemporary Photonics Technology (CPT 2006), Tokyo (Japan), pp. 145-148, January 2006, Invited Paper, invited,January 11-13 2006,Tokyo (Japan),Vol. 09 G-1 pp. 145-148

2005

• Matthias Seimetz, Ronald Freund
  Coherent Systems using Multi-Level Modulation Formats and Electronic Distortion Equalisation,
  Proc. Workshop on Optical Transmission an Equalisation (WOTE 2005), Shanghai,China, pp. 19-20, November 2005, B1
• Colja Schubert, Sebastian Ferber, M. Kroh, Carsten Schmidt-Langhorst, Reinhold Ludwig, B. Hüttl, Ronald Kaiser, Hans-Georg Weber
  40 GHz semiconductor mode-locked laser pulse source for 160 Gbit/s RZ-DPSK data transmission,
  Proc. 31th European Conference on Optical Communications (ECOC 2005), Glasgow (UK), p. 167, September 2005, Tu1.5.3, 25-29 September,Glasgow (UK),p. 167-8 vol. 2,paper Tu1.5.3
• C. Boerner, A. Benz, Sebastian Ferber, Reinhold Ludwig, L. Raddatz, Hans-Georg Weber, S. Weisser
  Burst switching capability of electro-optical PLL-based clock recovery for 170 Gbit/s,
  Proc. 31th Europ. Conference on Optical Communication (ECOC 2005), Glasgow (UK), p. 385, September 2005, Glasgow (UK),p. 385-6 vol. 3
• Sebastian Ferber, C. Boerner, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  640 Gbit/s DQPSK single-channel transmission over 480 km fibre link,
  Proc. 31th Europ. Conf. on Opt. Comm. (ECOC 2005), Glasgow (UK), p. 437, September 2005, Glasgow (UK),p. 437-8 vol. 3
• Reinhold Ludwig, C. Boerner, Sebastian Ferber, W.S. Lee, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  80 Gbit/s DPSK transmission over 480 km dispersion-managed fiber with balanced detection ETDM receiver,
  Proc. 31th Europ. Conf. on Opt. Comm. (ECOC 2005), Glasgow (UK), p. 381, September 2005, p. 381-2 vol. 3
• Sebastian Ferber, C. Boerner, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  640 Gbit/s DQPSK Single-channel Transmission over 480 km fibre link,
  Electronics Letters, Glasgow (UK), pp. 1236-1237, September 2005, vol 41,no. 22 (27 Oct. 2005),pp. 1236-1237
• Reinhold Ludwig
  Ultrafast transmission technology,
  Proc. 31th Europ. Conf. on Opt. Comm. (ECOC), Glasgow (UK), pp. 159-188, September 2005, Invited Paper, invited,25-29 Sep. 2005,Glasgow (UK),vol. 5,pp. 159-188
• Hans-Georg Weber, C. Boerner, Sebastian Ferber, F. Futami, M. Kroh, Reinhold Ludwig, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe
  Single Channel 1.28 Tbit/s and 2.56 Tbit/s DQPSK Transmission,
  Proc. 31th Europ. Conf. on Opt. Comm. (ECOC 2005), Glasgow (UK), pp. 3-4, September 2005, postdeadline
• V. Marembert, A.M. Melo, Klaus Petermann, S. Randel, Colja Schubert, Hans-Georg Weber
  Reduction of pattern effects in an SOA-based 40 Gb/s wavelength converter,
  Proc. Optical Amplifiers and Applications (OAA 2005), Budapest (Hungary), August 2005
• Reinhold Ludwig, C. Boerner, Sebastian Ferber, M. Kroh, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  Technologies enabling ultrahigh speed transmission,
  Proc. Optical Amplifiers and Applications (OAA 2005), Budapest (Hungary), August 2005, Invited Paper, invited,Budapest (Hungary),SUB 2
• Matthias Seimetz
  Multi-format Transmitters for Coherent Optical M-PSK and M-QAM Transmission,
  Proc. 7th International Conferenz on Transparent Optical Networks (ITCON 2005), Barcelona,Spain, July 2005, Th.B1.5
• Reinhold Ludwig, A. Benz, C. Boerner, Sebastian Ferber, L. Raddatz, Hans-Georg Weber, S. Weisser
  Single channel 170 Gbit/s transmission up to 4000 km using dispersion managed fiber spans and all raman amplification,
  Proc. 10th Optoelectronics and Commun. Conf. (OECC), Seoul (Korea), July 2005, postdeadline
• M. Malach, C.-A. Bunge, Ronald Freund, Lutz Molle, Klaus Petermann, H.J. Thiele
  Cross-Phase Modulation Suppression Method in Multispan Dispersion-Managed WDM Transmission Systems,
  Proc. 7th International Conference on Transparent Optical Networks (ITCON 2005), Barcelona, Spain , pp. 68-71, July 2005, We.C1.2
• Reinhold Ludwig, Sebastian Ferber, C. Boerner, Colja Schubert, Carsten Schmidt-Langhorst, M. Kroh, V. Marembert, Hans-Georg Weber
  160 Gbit/s transmission systems, ready for operation?,
  Proc. 10th Optoelectronics and Commun. Conf. (OECC), Seoul (Korea), pp. 772-773, July 2005, Invited Paper, invited
• M. Kroh, Sebastian Ferber, B. Hüttl, Hans-Georg Weber
  Low noise 400 fs pulse generation by monolithic semiconductor mode-locked laser and soliton pulse compression,
  Proc. Electro-Optics Europe (CLEO/Europe 2005), Munich (DE), p. 125, June 2005
• J. Mulet, M. Kroh, J. Mørk
  Pulsewidth and noise properties of external-cavity mode-locked semiconductor lasers: Simulations and experiments,
  Proc. Electro-Optics Europe (CLEO/Europe), Munich (Germany), p. 7, June 2005, 12-17 June 2005,Munich (Germany), p. 7
• Sebastian Ferber, C. Boerner, M. Kroh, Reinhold Ludwig, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  160 Gbit/s transmission with long-term stability,
  6. ITG-Fachtagung "Photonische Netze", Leipzig (DE), pp. 71-78, May 2005
• Carsten Schmidt-Langhorst, C. Boerner, Reinhold Ludwig, Colja Schubert
  Optical Sampling Technologies and Applications,
  Proc. 30th Conf. Optical Fiber Communications (OFC 2005), Anaheim (CA,US), March 2005, OtuG2, Invited Paper, invited
• Carsten Schmidt-Langhorst, C. Boerner, Sebastian Ferber, Reinhold Ludwig, V. Marembert, Colja Schubert, Hans-Georg Weber
  Optical sampling system including clock recovery for 320 Gbit/s DPSK and OOK data signals,
  Proc. 30th Conf. Optical Fiber Communications (OFC 2005), Anaheim (CA,US), March 2005, OWJ6
• Colja Schubert, V. Marembert, Carsten Schmidt-Langhorst, K. Schulze, Hans-Georg Weber
  Time division add-drop multiplexing up to 320 Gbit/s,
  Proc. 30th Conf. Optical Fiber Communications (OFC 2005), Anaheim (CA,US), March 2005, OThN2
• Ronald Freund, Lutz Molle, H.J. Thiele
  System margins and parameter tolerances of optical transmission sections in metro-networks for 40-Gbit/s-NRZ-ASK transmission,
  Proc. National Fiber Optic Engineers Conference (NFOEC 2005), Anaheim, CA (USA), March 2005, NThB1
• Andreas Beling, Heinz-Gunter Bach, Th. Eckhardt, Reinhard Kunkel, G.G. Mekonnen, Daniel Schmidt, Colja Schubert
  Highly efficient PIN photodetector module for 80 Gbit/s and Beyond,
  Techn. Dig. 30th Optical Fiber Communications Conf. (OFC 2005), Anaheim (USA), March 2005, OFM1
• S. Weisser, A. Benz, C. Boerner, Sebastian Ferber, Reinhold Ludwig, L. Raddatz, Hans-Georg Weber
  170 Gbit/s single-polarization transmission over 650 km SSMF with 130 km spans using RZ-DPSK,
  Proc. 30th Conf. Optical Fiber Communications (OFC 2005), Anaheim (CA,US), March 2005, OFF4
• C. Boerner, Sebastian Ferber, Reinhold Ludwig, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  320 Gbit/s clock recovery with electro-optical PLL using a bidirectionally operated electroabsorption modulator as phase comparator,
  Proc. 30th Conf. Optical Fiber Communications (OFC 2005), Anaheim (CA,US), March 2005, OtuO3
• H.J. Thiele, Ronald Freund, Lutz Molle
  40-Gb/s S-Band WDM Transmission Over Installed Fiber Links Using Erbium-Based Fiber Amplifiers,
  Proc. Optical Fiber Communication Conference (OFC 2005), Anaheim (USA), March 2005, OTuH1
• M. Malach, Ronald Freund, Lutz Molle, Klaus Petermann, H.J. Thiele
  Unterdrückung der XPM in 10 Gb/s WDM Übertragungssystemen,
  Workshop der ITG Fachgruppe 5.3.1, Dortmund, Germany, February 2005

2004

• Carsten Schmidt-Langhorst, J. Berger, C. Boerner, H.-J. Ehrke, Sebastian Ferber, E. Hilliger, M. Kroh, Reinhold Ludwig, V. Marembert, Colja Schubert, Hans-Georg Weber
  Ultrafast technologies in 160 Gbit/s transmission systems,
  Proc. Information Technologies and Communications (ITCOM 2004), Pennsylvania (US), pp. 249-259, October 2004, Invited Paper, invited,invited paper.
• V. Marembert, C. Boerner, Sebastian Ferber, F. Futami, M. Kroh, Reinhold Ludwig, Ryo Okabe, Carsten Schmidt-Langhorst, Colja Schubert, K. Schulze, Shigeki Watanabe, Hans-Georg Weber
  Single-channel 640 Gbit/s DPSK Transmission over a 160 km Fibre Link ,
  Proc. 30th Europ. Conf. on Optical Communication (ECOC 2004), Stockholm (Sweden), September 2004, Th4.4.2, postdeadline,paper Th4.4.2,on CD-ROM,postdeadline paper.
• Christof Börner, Sebastian Ferber, F. Futami, Reinhold Ludwig, Ryo Okabe, Carsten Schmidt-Langhorst, Colja Schubert, Shigeki Watanabe, Hans-Georg Weber
  160 Gbit/s clock recovery in a 3R-regenerating wavelength converter,
  Proc. 30th Europ. Conf. on Optical Communication (ECOC 2004), Stockholm, September 2004, We3.5.7, D249D249Stockholm (SE),paper We3.5.7.,on CD-ROM.
• M. Kroh, J. Berger, Christof Börner, Reinhold Ludwig, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber, Carl-M. Weinert
  Semiconductor mode-locked laser pulse source for 320 and 640 Gb/s RZ data transmitter,
  Proc. 30th Europ. Conf. on Optical Communication (ECOC 2004),Stockholm (SE), Stockholm (Sweden) , September 2004, We3.5.7
• Reinhold Ludwig, J. Berger, Christof Börner, Sebastian Ferber, E. Hilliger, M. Kroh, V. Marembert, C. Schmidt, Colja Schubert, Hans-Georg Weber
  160 Gb/s DPSK transmission system with high long-term stability,
  Proc. OptoElectronics and Communications Conf. (OECC 2004), Yokohama (J), pp. 472-473, July 2004, 14C4-2, paper 14C4-2,pp. 472 - 473,best paper award.
• T. Tekin, M. Schlak, Ch. Schmidt, Colja Schubert
  The influence of gain and phase dynamics in the integrated GS-SOA on the switching performance of the monolithically integrated GS-MZI,
  Techn. Dig. of Integrated Photonics Research (IPR 2004), San Francisco, June 2004, IWC4
• Sebastian Ferber, C. Boerner, F. Futami, Kai Habel, Reinhold Ludwig, Lutz Molle, Michael Rohde, Carsten Schmidt-Langhorst, Shigeki Watanabe, Hans-Georg Weber
  160 Gb/s regenerating conversion node,
  Proc. 29th Optical Fiber Communication Conference (OFC 2004), Los Angeles (US), March 2004, ThT2
• S. Kieckbusch, E. Brinkmeyer, A. Ehrhardt, Sebastian Ferber, Reinhold Ludwig, H. Rosenfeldt, Hans-Georg Weber
  Adaptive PMD compensator in 160 Gb/s DPSK transmission over installed fiber,
  Proc. 29th Conf. Optical Fiber Communications (OFC 2004), Los Angeles,CA,(USA), February 2004, PDP 31, postdeadline,post-deadline paper PDP 31.
• Reinhold Ludwig, C. Boerner, Sebastian Ferber, E. Hilliger, M. Kroh, V. Marembert, Carsten Schmidt-Langhorst, Colja Schubert, Hans-Georg Weber
  160 Gbit/s DPSK-transmission - technologies and system impact,
  Proc. 30th Europ. Conf. on Optical Communication (ECOC 2004), Stockholm (Sweden), January 2004, Tu1.1.3, Invited Paper, invited,Stockholm (Sweden),Tu1.1.3,invited paper.

2003

• Colja Schubert, G. Guekos, L. Schares, C. Schmidt, Hans-Georg Weber
  Phase dynamics in gain-transparent semiconductor optical amplifiers,
  Proc. 29th Europ. Conf. on Optical Communication (ECOC 2003), Rimini,Italy, pp. 1062-1063, September 2003, Th3.5.2, vol. 4,paper Th3.5.2,pp. 1062-1063.
• Andreas Beling, Heinz-Gunter Bach, J. Berger, Th. Eckhardt, G. Jacumeit, M. Kroh, Reinhard Kunkel, G.G. Mekonnen
  Fully Packaged INP-Based Photodetector for 80/85 GBit/s RZ Ssystems,
  Proc. 29th Europ. Conf. on Optical Communication (ECOC 2003), Rimini, Italy, pp. 82-83, September 2003, Th4.4.4, vol. 6,PD-paper Th4.4.4,pp. 82-83.
• M. Leich, J. Berger, W. Bronner, E. Dietrich, V. Hurm, K. Köhler, A. Leuther, R. Lösch, J. Rosenzweig, M. Schlechtweg, J. Sohn, H. Walcher
  Hybrid integrated optical receivers for high-speed data transmission,
  Proc. ITCom 2003, Orlando,(Florida,US), pp. 422-433, September 2003, Invited Paper, invited,vol. 5246, pp. 422-433,invited paper.
• B. Huettl, S. Fidorra, F. Foczianowski, H. Heidrich, G. Jacumeit, Ronald Kaiser, M. Kroh, Wolfgang Rehbein, R. Stenzel, H. Stolpe
  Monolithic Mode-Locked Laser on GaInAsP/InP for 160 Gb/s TDM Applications,
  Proc. 28th Optical Fiber Communication Conference (OFC 2003),Technical Digest, Atlanta (GA,US), pp. 675-676, March 2003
• M. Kroh, L. Kueller, Reinhold Ludwig, C. Schmidt, Hans-Georg Weber
  Investigations on phase noise in a semiconductor mode-locked laser,
  Proc. 28th Optical Fiber Communication Conference (OFC 2003), Atlanta (US), pp. 673-674, March 2003

2001

• E. Hilliger, J. Berger, Hans-Georg Weber, K. Yvind, P.M.W. Skovgaard, J. Hanberg
  The cascaded amplifier and saturable absorber (CASA) all-optical switch,
  Photonics in Switching 2001, Monterey,CA,USA, June 2001
• T. Tekin, H. Ehlers, M. Schlak, J. Berger, Colja Schubert, Björn-Thorsten Maul, R. Ziegler
  All-optical demultiplexing performance of monolithically integrated GS-MZI module,
  Intern. Workshop on Optical MEMS and Integrated Optics,Universität Dortmund, Dortmund,Germany, June 2001, 11-12 June 2001
• J. Berger, D. Breuer, U. Feiste, B. Konrad, Reinhold Ludwig, Klaus Petermann, Hans-Georg Weber, Carl-M. Weinert
  Optical TDM-Transmission Systems for Channel Rates of 40 Gbit/s and above,
  In: "ICTON´ 2001,3rd International Conference on Transparent Optical Net-Works,Conference Proceedings, Krakau,Polen, IEEE, June 2001, Invited Paper, invited,Krakau/Polen". IEEE,Piscataway NJ (Hg.). June 18-21,2-5,2001.
• L.K. Oxenløwe, Colja Schubert, C. Schmidt, E. Hilliger, J. Berger, U. Feiste, Reinhold Ludwig, Hans-Georg Weber
  Optical Clock Recovery Employing an Optical PLL Using Cross-Phase Modulation in a Sagnac-Interferometer,
  Conf. on Lasers and Electro-Optics (CLEO) Tech. Dig., Baltimore,USA, May 2001, CThU2, 6-11 May 2001,paper CThU2.
• Hans-Georg Weber, Reinhold Ludwig, U. Feiste, C. Schmidt, E. Hilliger, Colja Schubert, J. Berger, M. Kroh, T. Yamamoto
  Optical Signal Processing for High Speed Communication Systems,
  Invited paper,10th European Conference on Integrated Optics (ECIO 2001), Paderborn, pp. 147-152, April 2001, Invited Paper, invited,,4.4.01-6.4.01 Paderborn,147-152,2001
• E. Pawlowski, G.L. Yurista, L. Küller, Reinhold Ludwig, A.A. Friesen, Hans-Georg Weber
  Tunable Grating-Waveguide Structure Filter: Design,Fabrication and Application,
  10th European Conference on Integrated Optics (ECIO), Paderborn, April 2001, 4.4.01-6.4.01 Paderborn,2001
• Carl-M. Weinert, C. Schmidt, Hans-Georg Weber
  Application of asynchronous amplitude histograms for performance monitoring of RZ signals,
  Proc. 26th Optical Fiber Commun.,March 17-22 2001, Anaheim,CA,(USA), March 2001, WDD41, March 17-22 2001,paper WDD41

2000

• Reinhold Ludwig, U. Feiste, S. Diez, Colja Schubert, C. Schmidt, H.-J. Ehrke, Hans-Georg Weber
  Unrepeatered 160 Gbit/s RZ single channel transmission over 160 km of standard fiber at 1.55 µm with hybrid MZI optical DEMUX.,
  Proc. 26th Europ. Conf. Opt. Commun., Munich,Germany, September 2000, 6.1.3
• Reinhold Ludwig, U. Feiste, S. Diez, Colja Schubert, C. Schmidt, Hans-Georg Weber
  Towards the All-Optical 3R Regenerator: Present Status and Challenges,
  Techn. Dig. of Optoelectronics and Communications Conference (OECC 2000),Makuhari Messe, Japan, July 2000
• U. Feiste, Reinhold Ludwig, S. Diez, C. Schmidt, H.-J. Ehrke, Hans-Georg Weber, F. Küppers
  Unrepeatered 80 Gbit/s RZ single channel transmission over 160 km of standard fiber at 1.55 µm with a large wavelength tolerance,
  Proc. 25th Optical Fiber Commun., Baltimore (MD),USA, March 2000, TuD5, March 7-10 2000,paper TuD5.
• G. Toptchiyski, Klaus Petermann, S. Diez, E. Hilliger, C. Schmidt, Reinhold Ludwig, Hans-Georg Weber
  Evaluation of switching windows for fast optically-controlled SOA switches,
  Proc. 25th Optical Fiber Commun.2000, Baltimore (MD),USA, March 2000, ThF4, paper ThF4,March 7-10 2000.

2024

• Guillermo von Hünefeld, Enes Seker, Rijil Thomas, Stephan Suckow, Gregor Ronniger, Mahdi Kaveh, Pooyan Safari, Isaac Sackey, David Stahl, Colja Schubert, Johannes Fischer, Ronald Freund, Max Lemme
  Robust Fabrication of Photonic Neuromorphic Reservoir for Modulation Format Identification,
  European Conference on Intgrated Optics- ECIO 2024, Aachen, June 2024, Talk

2023

• Ruben S. Luis, Giammarco Di Sciullo, Georg Rademacher, Benjamin Puttnam, Andrea Marotta, Robert Emmerich, Nicolas Braig-Christophersen, Ralf Stolte, Fabio Graziosi, A. Mecozzi, Colja Schubert, Tetsuya Hayashi, Takuji Nagashima, Cristian Antonelli, Hideaki Furukawa
  Colorless and Directionless ROADM for Meshed Coupled-Core Multicore Fiber Networks,
  OFC 2023, San Diego, USA, March 2023, arXiv: https://ieeexplore.ieee.org/abstract/document/10116591/authors#authors, Talk
• Alberto Gatto, Paola Parolari, Ruben S. Luis, Georg Rademacher, Benjamin Puttnam, Robert Emmerich, Colja Schubert, Giuseppe Ferri, F. Achten, Pierre Sillard, Paolo Martelli, Giammarco Di Sciullo, Fabio Graziosi, Andrea Marotta, A. Mecozzi, Cristian Antonelli, Pierpaolo Boffi
  Partial MIMO-based Mode Division Multiplexing Transmission over the First Field-Deployed 15-Mode Fiber in Metro Scenario,
  Proc. Optical Fiber Communications Conference (OFC), San Diego, USA, March 2023, Talk
• Paola Parolari, Alberto Gatto, Ruben S. Luis, Georg Rademacher, Benjamin Puttnam, Robert Emmerich, Colja Schubert, Giuseppe Ferri, F. Achten, Pierre Sillard, Paolo Martelli, Giammarco Di Sciullo, Fabio Graziosi, Andrea Marotta, A. Mecozzi, Cristian Antonelli, Pierpaolo Boffi
  Demonstration of Multi-Hop Mode-Group Routing in a Field-Deployed Multi-Mode Fiber Network,
  Proc. Optical Fiber Communications Conference (OFC), San Diego, USA, March 2023, Talk
• Milan Deumer, Oliver Stiewe, Simon Nellen, Robert Kohlhaas, Colja Schubert, Robert Elschner, Ronald Freund, Martin Schell
  Purely Photonic Wireless Link at 120 GHz Carrier Frequency Enabled by Heterodyne Detection with a Photoconductive Antenna,
  PW 2023, San Francisco, USA, January 2023, Talk
• Guillermo von Hünefeld, Gregor Ronniger, Enes Seker, Rijil Thomas, Pooyan Safari, Isaac Sackey, Md Mahasin Khan, Stephan Suckow, Max Lemme, David Stahl, Colja Schubert, Johannes Fischer, Ronald Freund
  Experimental Demonstration of Optical Modulation Format Identification Using SOI-based Photonic Reservoir,
  ECOC 2023, San Diego, USA, 2023, Talk

2022

• Carsten Schmidt-Langhorst, Johannes Pfeiffer, Robert Elschner, Robert Emmerich, Fabian Chowanek, In-Ho Baek, Robert F. H. Fischer, Colja Schubert
   Experimental Investigation of Information Bit Scrambling for Physical-Layer Security in Coherent Fiber-Optic Systems,
  23rd ITG Symposium on Photonic Networks, Berlin, September 2022, arXiv: https://ieeexplore.ieee.org/document/9861853, Talk

2021

• Robert Emmerich, Matheus Ribeiro Sena, Mustafa Sezer Erkilinc, Isaac Sackey, Robert Elschner, Carsten Schmidt-Langhorst, Colja Schubert, Ronald Freund
  S-Band Transmission with Off-the-Shelf C-Band Components Enabled by Nonlinear Predistortion based on Coherent System Identification,
  Photonic Networks; 22th ITG-Symposium, Online, August 2021, arXiv: https://ieeexplore.ieee.org/document/9472219, Talk
• Robert Emmerich, Matheus Ribeiro Sena, Robert Elschner, Carsten Schmidt-Langhorst, Isaac Sackey, Colja Schubert, Ronald Freund
  Enabling S-C-L-Band Systems with Standard C-Band Modulator and Coherent Receiver using Nonlinear Predistortion,
  Proc. Optical Fiber Communication Conference (OFC 2021),San Francisco(USA), Online, August 2021, arXiv: https://ieeexplore.ieee.org/abstract/document/9489930, Talk

2020

• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert, Ronald Freund
  Real-Time Demostration of a 100 Gb/s THz-Wireless Fiber Extender,
  ITG Fachtatung Photonische Netze 2020, Leipzig, 2020, Talk
• Carlos Moises Castro Posada, Robert Elschner, Thomas Merkle, Colja Schubert, Ronald Freund
  Long-Range High-Speed THz-Wireless Transmission in the 300 GHz Band,
  IWMTS 2020, 2020, Invited Talk
• Robert Emmerich, António Eira, Nelson Costa, Pablo Wilke Berenguer, Robert Elschner, Colja Schubert, Johannes Fischer, João Pedro, Ronald Freund
  Dual-Band Node Architectures for C+L-Band Capacity Upgrades in Optical Metro Transport Networks,
  Photonic Networks; 21th ITG-Symposium, Online, 2020, Talk
• Johannes Pfeiffer, Carsten Schmidt-Langhorst, Robert Elschner, Felix Frey, Robert Emmerich, Colja Schubert, Robert F. H. Fischer
  Security Gap Investigation of Multilevel Coding in Coherent Fiber-Optical Systems,
  21st ITG Symposium Photonic Networks, 24-25 Nov 2020, Online, 2020, Talk

2016

• Markus Nölle, Johannes Fischer, Colja Schubert
  Transmission in Elastic Optical Networks,
  In: Elastic Optical Networks, Springer International Publishing, Heidelberg, Germany, ISBN: 978-3-319-30173-0, pp. 83-116, 2016, doi: 10.1007/978-3-319-30174-7, Book Chapter

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