Communications Engineering Lab
Prof. Dr.-Ing.  Laurent Schmalen KIT

Prof. Dr.-Ing. Laurent Schmalen

Curriculum

Awards Invited Talks and Presentations Full List of Publications

 

Education and Work Experience

1999 Secondary education at Lycée Classique Diekirch
2005 Dipl.-Ing. (cum laude) in electrical engineering and information technology from RWTH Aachen University
2011 PhD/Dr.-Ing. (summa cum laude) in electrical engineering and information technology from RWTH Aachen University at the Institute of Communication Systems and Data Processing
2011-2019 Industrial research at Bell Labs
2014-2019 Guest lecturer at University of Stuttgart

 

Research Topics

  • Channel coding and coded modulation
  • High speed data transmission
  • Optical communications
  • Transmission over channels with nonlinear characteristics

 

Member of Professional Associations

 

Awards and Recognitions

2019 IEEE/OSA Journal of Lightwave Technology 2016 Best Paper Award
2019 IEEE/OSA Journal of Lightwave Technology Outstanding Reviewer Recognition
2019 Participation at the German-American Frontiers of Engineering Symposium (GAFOE) of the
Alexander von Humboldt-Stiftung
2018 "Most Innovative AI Solution" at the Nokia Artificial Intelligence Conference
2018 Nokia ION Business Excellence Award
2015 Exemplary Reviewer Award of the IEEE Transactions on Communications
2014 Bell Labs President’s Award
2013 Bob Owens Best Student Paper Award at the IEEE Signal Processing Systems (SiPS) workshop
2012 Friedrich-Wilhelm-Preis of the RWTH Aachen University for outstanding scientific achievements in the PhD thesis
2012 Borchers-Plakette of the RWTH Aachen University
2011 E-Plus-Preis for an outstanding PhD thesis in communications
2010 Best Paper Award at the 9th ITG Conference on Speech Communication
2006 Friedrich-Wilhelm-Preis of the RWTH Aachen University for outstanding scientific achievements in the diploma thesis
2005 Springorum-Denkmünze for a diploma passed with distinction
2002 Aachen VDE Award

 

Selected Publications

  • B. Karanov, M. Chagnon, F. Thouin, T. A. Eriksson, H. Bülow, D. Lavery, P. Payvel and L. Schmalen, “End-to-end Deep Learning of Optical Fiber Communications,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 20, pp. 4843-4855, Oct. 2018 [IEEEXplore Open Access], [arXiv]
  • V. Aref, N. Rengaswamy and L. Schmalen, “Finite-Length Analysis of Spatially-Coupled Regular LDPC Ensembles on Burst-Erasure Channels”, IEEE Transactions on Information Theory, vol. 64, no. 5, pp. 3431-3449, May 2018 [IEEEXplore], [arXiv]
  • L. Schmalen, A. Alvarado and R. Rios-Müller, “Performance Prediction of Nonbinary Forward Error Correction in Optical Transmission Experiments”, IEEE/OSA Journal of Lightwave Technology, vol. 35, no. 3, pp. 1015-1027, Feb. 2017 [IEEEXplore Open Access], [arXiv]
  • F. Buchali, F. Steiner, G. Böcherer, L. Schmalen, P. Schulte and W. Idler, “Rate Adaptation and Reach Increase by Probabilistically Shaped 64-QAM: An Experimental Demonstration”, IEEE/OSA Journal on Lightwave Technology, vol. 34, no. 87, pp. 1599-1609, Apr. 2016 [IEEEXplore]
  • L. Schmalen, “A Low-Complexity LDPC Coding Scheme for Channels with Phase Slips”, IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 7, pp. 1319-1325, Apr. 2015 [IEEEXplore]
  • L. Schmalen, V. Aref, J. Cho, D. Suikat, D. Rösener, and A. Leven, “Spatially Coupled Soft-Decision Forward Error Correction for Future Lightwave Systems”, IEEE/OSA Journal on Lightwave Technology, vol. 33, no. 5, pp. 1109-1116, Mar. 2015 [IEEEXplore]
  • A. Leven and L. Schmalen, “Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems”, IEEE/OSA Journal on Lightwave Technology, vol. 32, no. 16, pp. 2735-2750, Aug. 2014 [IEEEXplore]
  • L. Schmalen, F. Buchali, A. Leven, and S. ten Brink, “A Generic Tool for Assessing the Soft-FEC Performance in Optical Transmission Experiments”, IEEE Photonics Technology Letters, vol. 24, no. 1, pp. 40-42, Jan. 2012 [IEEEXplore]
  • L. Schmalen and P. Vary, “Iterative Source-Channel Decoding with Reduced Error Floors”, IEEE Journal on Selected Topics in Signal Processing, vol. 5, no. 8, pp. 1577-1587, Dec. 2011 [IEEEXplore]
  • L. Schmalen, M. Adrat, T. Clevorn, and P. Vary, “EXIT-Chart Based System Design For Iterative Source-Channel Decoding with Fixed-Length Codes”, IEEE Transactions on Communications, vol. 59, no. 9, pp. 2406-2413, Sep. 2011 [IEEEXplore]

 

Invited Talks and Presentations

Dec. 2020 European Conference on Optical Communications (ECOC), Brussels, Belgium
"End-to-End Learning in Optical Fiber Communications: Concept and Transceiver Design”
Nov. 2020 IEEE European School of Information Theory (ESIT), Stuttgart, Germany
"Spatially Coupled LDPC Codes - Theory and Applications"
Oct. 2020 Aston Mini-Symposium and Tutorial on numerical implementation of Bayesian filtering for signal equalisation and demodulation
"Bayes’ Theorem and the BCJR Algorithm – Swiss Army Knife for Communication Engineers”
Sep. 2020 IEEE Photonics Conference (IPC), Special Symposium for Machine Learning in Photonic Systems
"Optical Fiber Communication Systems Based on End-to-End Deep Learning”
Feb. 2020 DLR-MIT-TUM Workshop on Coding and Random Access, Oberpfaffenhofen, Germany
"Burst Correction Capabilities of Spatially Coupled LDPC Codes: Finite-length Analysis and Application Example"
Feb. 2020 KIT Karlsruhe, Workshop der ITG Fachgruppe KT 3.1 "Modellierung photonischer Komponenten und Systeme"
"Deep Learning zur Datenübertragung und Kanalapproximation in photonischen Systemen - Einführung und Anwendungsbeispiele" (in German)
Dec. 2019 TU Einhoven, van der Meulen Seminar organized by the Benelux Chapter on Information Theory.
"End-to-End Deep Learning of Optical Fiber Communications"
Oct. 2019 Chalmers University of Technology, DIMENSIONS project kick-off meeting. Keynote talk
"Design of “Low-Cost Optical Communication Systems Using Deep Learning - A Viable Solution?"
Aug. 2019 Information Theory Workshop (ITW) in Lyngby, Sweden
"Spatially Coupled LDPC Codes with Non-uniform Coupling for Improved Decoding Speed"
Jul. 2019 TU Munich, Guest Lecture
"Spatially Coupled LDPC Codes
June 2019 DTU Lyngby
"End-to-end Deep learning of Optical Communications using Bidirectional Recurrent Neural Networks"
Mar. 2019 International Conference on Advanced Optical Technologies in Erlangen, Keynote Presentation
"Communicate to the Limit – A Journey Towards Reliable Optical Communications and Beyond"
Mar. 2019 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA, Workshop "Optical Experiments and Testing, With or Without FEC?"
"How to Evaluate Optical Transmission Experiments?"
Mar. 2019 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA, Show-Floor-Programm "Innovations with Machine Learning in Optical Networks Drive Process Automation"
"Machine Learning in Optical Communications: Promises and Potential"
Mar. 2019 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA, Shannon Theatre
"FEC and Shaping in Optical Networks"
Feb. 2019 DLR Oberpfaffenhofen, 2019 Oberpfaffenhofen Workshop on High Throughput Coding (OWHTC), DLR, Oberpfaffenhofen
"Spatial Coupling - Essential Technology for High Throughput Coding?"
Sep. 2018 European Conference on Optical Communications (ECOC) in Rome, Italy
"Performance Metrics for Forward Error Correction in Fiber-optic Communication Systems"
Jun. 2018 Bell Labs President’s Seminar in Murray Hill, NJ, USA
"Communicate to the Limit – A Journey towards Reliable Networks and Beyond"
Apr. 2018 TU Eindhoven, Eindhoven Workshop on Optical Communications (EWOC)
"Spatially Coupled Codes in Optical Communications: Technology for the Physical Layer and Beyond"
Mar. 2018 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA
"Probabilistic Constellation Shaping: Challenges and Opportunities for Forward Error Correction"
Mar. 2018 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA, Workshop on "DSP for Short Reach and Client Optics – What Makes Sense?"
"Forward Error Correction for Short Reach Communications"
Mar. 2018 Optical Fiber Communications Conference (OFC) in San Diego, CA, USA, Shannon Theatre
"FEC and Shaping in Optical Networks"
Feb. 2018 Chalmers Univeristy of Technology, KAW Energy Efficiency Workshop
"Spatially Coupled LDPC Codes – Potential Applications in Optical Communications and Recent Results"
Jan. 2018 TU Chemnitz
"Spatial Coupling - A Versatile Tool for High-Speed Communications Close to the Theoretical Limits"
Dec. 2017 Universität Siegen
"Spatial Coupling - A Versatile Tool for Communicating Close to the Theoretical Limits"
Oct. 2018 KIT Karlsruhe
"Channel Coding for High-Speed Communications – Recent Advances Using Spatially Coupled Codes"
Sep. 2017 DTU Lyngby, Special ECOC 2017 Symposium
"SASER – A European Success Story"
Jul. 2017 RWTH Aachen University, GfK-Kolloquium
"Kommunikation nahe der theoretischen Grenzen – von der iterativen Quellen-Kanaldecodierung zu optischen Hochgeschwindigkeitsnetzen"
Jun. 2017 Nokia AON (Agile Optical Networks) Tech Summit China, Beijing, China, Plenary Talk
"A Look into the Future of Optical Networks"
May 2017 Nokia AON (Agile Optical Networks) Tech Summit APAC, Sydney, Australien, Plenary Talk
"A Look into the Future of Optical Networks"
Apr. 2017 TU Eindhoven
"Channel Coding for High-Speed Optical Communications – Status and Recent Advances Using Spatially Coupled Codes"
Nov. 2016 Ecole Polytechnique Fédérale de Lausanne (EPFL)
"Channel Coding for High-Speed Optical Communications – Status and Recent Advances Using Spatially Coupled Codes"
Jul. 2016 FAU Erlangen
"Channel Coding for High-Speed Optical Communications – Status and Recent Advances Using Spatially Coupled Codes"
Feb. 2016 Bell Labs Colloquium, Stuttgart, Germany
"Forward Error Correction for High-Speed Optical Communications – Status and Recent Advances"
Nov. 2015 Asia Communications & Photonics Conference (ACP)
"Next-Generation Forward Error Correction: Can We Close the Gap to the Shannon Limit?"
Oct. 2015 Télécom ParisTech
"LDPC Coding Schemes for Optical Communications Affected by Phase Slips"
Oct. 2015 IEEE Photonics Conference (IPC)
"Novel Forward Error Correction Concepts for Coherent Optical Communications"
Jun. 2015 IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)
"Spatially Coupled Codes and Optical Fiber Communications: An Ideal Match?" (invited poster)
Dec. 2014 Workshop on Information Theory of Optical Fibers, TU Munich
"Code Design for Channels Affected by Phase Slips"
Dec. 2014 KTH Stockholm
"Forward Error Correction for Optical Long-Haul Networks – Challenges and Recent Developments"
Sep. 2014 European Conference on Optical Communications (ECOC) in Cannes, France
"Next Generation Error Correcting Codes for Lightwave Systems"
Mar. 2014 Optical Fiber Communications Conference (OFC) in San Francisco, CA, USA
"Energy Efficient FEC for Optical Transmission Systems"
Jan. 2014 Universität Stuttgart, Kolloquium of Faculty 5
"Forward Error Correction for Optical Long-Haul Networks – Challenges and Recent Developments"
Jul. 2013 RWTH Aachen University, GfK-Kolloquium
"Modulation and Coding in Optical Core Networks"
Sep. 2012 TU Kaiserslautern, Workshop "Iterative Receivers"
"Modulation and Coding in Optical Core Networks"
Oct. 2010 Bell Labs, Alcatel-Lucent, Stuttgart, Germany
"Iterative Source-Channel Decoding: Design and Optimization for Heterogeneous Networks"
Jun. 2008 Nokia Research in Tampere Finland, Flexcode Seminar "Turbo Source Coding"
Jun. 2007 Orange/France Telecom Research Lab Lannion, Flexcode Seminar
"Modern Techniques for Flexible, Iterative Source-Channel Decoding"

 

Full List of Publications

A complete list of publications can be found on my Google Scholar profile.

Journal papers

  1. S. Thai Le, K. Schuh, F. Buchali, X.-Q. Du, M. Grözing, M. Berroth, L. Schmalen, and H. Bülow, "Single Sideband Transmission Employing a 1-to-4 ADC Frontend and Parallel Digitization," IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 12, Jun. 2020
  2. A. Teixeira, D. Lavery, E. Ciaramella, L. Schmalen, N. Iiyama, R. Ferreira, and S. Randel, “DSP enabled Optical Detection Techniques for PON,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 3, Feb. 2020
  3. S. Thai Le, K. Schuh, R. Dischler, F. Buchali, L. Schmalen and H. Bülow, “Beyond 400 Gb/s Direct Detection over 80km for Data Center Interconnect Applications,” IEEE/OSA Journals of Lightwave Technology, vol. 38, no. 2, Jan. 2020
  4. A. Elkelesh, M. Ebada, S. Cammerer, L. Schmalen, and S. ten Brink, “Decoder-in-the-Loop: Genetic Optimization-based LDPC Code Design,” IEEE Access, vol. 7, Sep. 2019
  5. B. Karanov, D. Lavery, P. Payvel and L. Schmalen, “End-to-End Optimized Transmission over Dispersive Intensity-Modulated Channels Using Bidirectional Recurrent Neural Networks,” OSA Optics Express, vol. 27, no. 14, pp. 19650-19663, also available as arXiv:1901.08570
  6. B. Karanov, M. Chagnon, F. Thouin, T. A. Eriksson, H. Bülow, D. Lavery, P. Payvel and L. Schmalen, “End-to-end Deep Learning of Optical Fiber Communications,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 20, pp. 4843-4855, Oct. 2018, also available as arXiv:1804.04097
  7. A. Buchberger, A. Graell i Amat, V. Aref and L. Schmalen, “Probabilistic Eigenvalue Shaping for Nonlinear Fourier Transform Transmission,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 20, pp. 4799-4807, Oct. 2018, also available as arXiv:1712.08467
  8. V. Aref, N. Rengaswamy and L. Schmalen, “Finite-Length Analysis of Spatially-Coupled Regular LDPC Ensembles on Burst-Erasure Channels”, IEEE Transactions on Information Theory, vol. 64, no. 5, pp. 3431-3449, May 2018, also available as  arXiv:1611.08267
  9. H. Bülow, V. Aref and L. Schmalen, “Modulation of Discrete Nonlinear Spectrum: Perturbation Sensitivity and Achievable Rates,” IEEE Photonics Technology Letters, vol. 30, no. 5, pp. 423-426, Mar. 2018
  10. I. Fernandez de Jauregui Ruiz, A. Ghazisaeidi, O, Ait Sab, P. Plantady, A. Calsat, S. Dubost, L. Schmalen, V. Letellier, and J. Renaudier, “25.4 Tb/s Transmission over Trans-Pacific Distances Using Truncated Probabilistically Shaped PDM-64QAM”, IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 6, pp. 1354-1361, Mar. 2018
  11. J. Cho, X. Chen, S: Chandrasekhar, G. Raybon, R. Dar, L. Schmalen, E. Burrows, A. Adamiecki, S. Corteselli, Y. Pan, D. Correa, B. McKay, S. Zsigmond, P. J. Winzer, and S. Grubb, “Trans-Atlantic Field Trial Using High Spectral Efficiency Probabilistically Shaped 64-QAM and Single-Carrier Real-Time 250-Gb/s 16-QAM”, IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 1, pp. 103-113, Jan. 2018
  12. W. Lautenschläger, N. Benzaoui, F. Buchali, L. Dembeck, R. Dischler, B. Franz, J. Milbrandt, Y. Pointurier, D. Rösener, L. Schmalen and A. Leven, “Optical Ethernet – Flexible Optical Metro Networks”, IEEE/OSA Journal of Lightwave Technology, vol. 35, no. 12, pp. 2346-2357, Jun. 2017
  13. W. Idler, F. Buchali, L. Schmalen, E. Lach, R.-P. Braun, G. Böcherer, P. Schulte and F. Steiner, “Field Trial of a 1Tbit/s Super-Channel Network Using Probabilistically Shaped Constellations”, IEEE/OSA Journal of Lightwave Technology, vol. 35, no. 8, pp. 1399-1406, April 2017
  14. A. Ghazisaeidi, I. Fernandez de Jaregui Ruiz, R. Rios-Müller, L. Schmalen, P. Tran, P. Brindel, A. Carbo Meseguer, Q. Hu, F. Buchali, G. Charlet and J. Renaudier, “Advanced C+L Band Transoceanic Transmission Systems Based on Probabilistically-Shaped PDM-64QAM”, IEEE/OSA Journal of Lightwave Technology, vol. 35, no. 7, pp. 1291-1299, April 2017
  15. L. Schmalen, A. Alvarado and R. Rios-Müller, “Performance Prediction of Nonbinary Forward Error Correction in Optical Transmission Experiments”, IEEE/OSA Journal of Lightwave Technology, vol. 35, no. 3, Feb. 2017, pp. 1015-1027, also available as  arXiv:1606.00755v2
  16. A. Ghazisaeidi, I. Fernandez, L. Schmalen, P. Tran, C. Simonneau, E. Awwad, B. Uscumlic, P. Brindel, and G. Charlet, “Submarine Transmission Systems Using Digital Nonlinear Compensation and Adaptive-Rate Forward Error Correction”, IEEE/OSA Journal of Lightwave Technology, vol. 34, no. 8, pp. 1886-1895, Apr. 2016
  17. F. Buchali, F. Steiner, G. Böcherer, L. Schmalen, P. Schulte and W. Idler, “Rate Adaptation and Reach Increase by Probabilistically Shaped 64-QAM: An Experimental Demonstration”, IEEE/OSA Journal of Lightwave Technology, vol. 34, no. 87, pp. 1599-1609, Apr. 2016
    – IEEE/OSA Journal of Lightwave Technology 2016 Best Paper Award –
  18. C. Pan, H. Bülow, L. Schmalen, W. Idler, and F. R. Kschischang, “Optical Nonlinear-Phase-Noise Compensation for 32 Gbaud PolDM-16 QAM Transmission Using a Code-Aided Expectation-Maximization Algorithm”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 17, pp. 3679-3686, Sep. 2015
  19. A. Ghazisaeidi, L. Schmalen, I. Fernandez, C. Simmoneau, P. Tran, P. Brindel, and G. Charlet, “Transoceanic Transmission Systems Using Adaptive Multi-Rate FECs”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 7, pp. 1479-1487, Apr. 2015
  20. J. Renaudier, R. Rios-Müller, P. Tran, L. Schmalen, and G. Charlet, “Spectrally Efficient 1-Tb/s Transceivers for Long-haul Optical Systems”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 7, pp. 1452-1458, Apr. 2015
  21. R. Rios-Müller, J. Renaudier, P. Brindel, A. Ghazisaeidi, I. Fernandez, P. Tran, C. Simmoneau, L. Schmalen and G. Charlet, “Spectrally Efficient 400-Gb/s Single Carrier Transport over 7200 km”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 7, pp. 1402-1407, Apr. 2015
  22. L. Schmalen, “A Low-Complexity LDPC Coding Scheme for Channels with Phase Slips”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 7, pp. 1319-1325, Apr. 2015
  23. L. Schmalen, V. Aref, J. Cho, D. Suikat, D. Rösener, and A. Leven, “Spatially Coupled Soft-Decision Forward Error Correction for Future Lightwave Systems”, IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 5, pp. 1109-1116, Mar. 2015
  24. M. Beermann, E. Monzó, L. Schmalen, and P. Vary, “GPU Accelerated Belief Propagation Decoding of Non-Binary LDPC Codes with Parallel and Sequential Scheduling”, Springer Journal on Signal Processing Systems, vol. 78, no. 1, pp. 21-34, Jan. 2015
  25. A. Leven and L. Schmalen, “Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems”, IEEE/OSA Journal of Lightwave Technology, vol. 32, no. 16, pp. 2735-2750, Aug. 2014
  26. L. Schmalen, A. J. de Lind van Wijngaarden, and S. ten Brink, “Forward Error Correction in Optical Core and Access Networks”, Bell Labs Technical Journal, vol. 18, no. 3, pp. 39-66, Dec. 2013
  27. L. Schmalen, F. Buchali, A. Leven, and S. ten Brink, “A Generic Tool for Assessing the Soft-FEC Performance in Optical Transmission Experiments”, IEEE Photonics Technology Letters, vol. 24, no. 1, pp. 40-42, Jan. 2012
  28. L. Schmalen and P. Vary, “Iterative Source-Channel Decoding with Reduced Error Floors”, IEEE Journal of Selected Topics in Signal Processing, vol. 5, no. 8, pp. 1577-1587, Dec. 2011
  29. A. Leven, F. Vacondio, L. Schmalen, S. ten Brink, and W. Idler, “Estimation of Soft FEC Performance in Optical Transmission Experiments”, IEEE Photonics Technology Letters, vol. 23, no. 20, pp. 1547-1549, Oct. 2011
  30. L. Schmalen, M. Adrat, T. Clevorn, and P. Vary, “EXIT-Chart Based System Design For Iterative Source-Channel Decoding with Fixed-Length Codes”, IEEE Transactions on Communications, vol. 59, no. 9, pp. 2406-2413, Sep. 2011
  31. T. Clevorn, L. Schmalen, P. Vary, and M. Adrat: “On Redundant Index Assignments for Iterative Source-Channel Decoding”, IEEE Communications Letters, vol. 12, pp. 514–516, Jul. 2008

Book chapters

  1. A. Graell i Amat and L. Schmalen, “Forward Error Correction for Optical Transponders”, Springer Handbook of Optical Networks, B. Mukherjee, I. Tomkos, M. Tornatore, P. Winzer, and Y. Zhao (editors), Springer, October 2020
  2. L. Schmalen, S. ten Brink, and A. Leven, “Advances in Detection and Error Correction for Coherent Optical Communications: Regular, Irregular, and Spatially Coupled LDPC Code Designs”, in Enabling Technologies for High Spectral-Efficiency Coherent Optical Communication Networks, C. Xie and X. Zhou (editors), John Wiley & Sons Ltd., Mar. 2016, also available as arXiv:1704.04618
  3. A. Leven and L. Schmalen, “Implementation Aspects of Coherent Transmit and Receive Functions in Application-Specific Integrated Circuits”, in Optical Fiber Telecommunications VI-A, Ivan P. Kaminow, Tingye Li, and Alan E. Willner (editors), Academic Press, Jun. 2013
  4. M. Adrat, T. Clevorn, and L. Schmalen, “Iterative Source-Channel Decoding & Turbo DeCodulation”, in Advances in Digital Speech Transmission, R. Martin, U. Heute, and C. Antweiler (editors), John Wiley & Sons, Ltd., Jan. 2008

Conference papers (peer-reviewed)

  1. A. Buchberger, C. Häger, H. D. Pfister, L. Schmalen, and A. Graell i Amat, “Learned Decimation for Neural Belief Propagation Decoders ,”  submitted to IEEE International Confererence on Acoustics, Speech and Signal Processing (ICASSP), Toronto, Canada,  Jun. 2021
  2. B. Karanov, P. Bayvel, and L. Schmalen, "End-to-end Learning in Optical Fiber Communications: Concept and Transceiver Design," European Conference on Optical Communications (ECOC), Brussels, Belgium (fully virtual), Dec. 2020
    – Invited Paper –
  3. B. Karanov, V. Oliari, M. Chagnon, G. Liga, A. Alvarado, V. Aref, D. Lavery, P. Bayvel, and L. Schmalen, "End-to-end Learning in Optical Fiber Communications: Experimental Demonstration and Future Trends,European Conference on Optical Communications (ECOC), Brussels, Belgium (fully virtual), Dec. 2020
    – Invited Paper –
  4. T. Eriksson, R. Luis, G. Rademacher, B. Puttnam, K. Gümüs, L. Schmalen, A. Alvarado, H. Furukawa, N. Wada, T. Hirano, M. Sasaki, M. Takeoka, "Challenges in Coding, DSP and Parallel Operation of Quantum Key Distribution and Coherent Data Transmission,European Conference on Optical Communications (ECOC), Brussels, Belgium (fully virtual), Dec. 2020
    – Invited Paper –
  5. B. Karanov, M. Chagnon, V. Aref, F. Ferreira, D. Lavery, P. Bayvel, and L. Schmalen, “Experimental Investigation of Deep Learning for Digital Signal Processing in Short Reach Optical Fiber Communications,” IEEE Workshop on Signal Processing Systems (SiPS), Coimbra, Portugal (fully virtual), Oct. 2020
    – Invited Paper –
  6. B. Karanov, M. Chagnon, V. Aref, D. Lavery, P. Bayvel, and L. Schmalen, “Optical Fiber Communication Systems Based on End-to-End Deep Learning,” IEEE Photonics Conference (IPC), Special Symposium for Machine Learning in Photonic Systems (SS MLPS), Vancouver, Canada (fully virtual), Sep. 2020
    – Invited Paper –
  7. A. Buchberger, C. Häger, H. D. Pfister, L. Schmalen, and A. Graell i Amat, “Pruning Neural Belief Propagation Decoders,” IEEE International Symposium on Information Theory (ISIT), Los Angeles, CA, USA (fully virtual), Jun. 2020
  8. B. Karanov, M. Chagnon, V. Aref, D. Lavery, P. Bayvel, and L. Schmalen, “Concept and Experimental Demonstration of Optical IM/DD End-to-End System Optimization using a Generative Model,” Optical Fiber Communications Conference (OFC), San Diego, CA, USA, paper Th2A.48, Mar. 2020
  9. B. Karanov, G. Liga, V. Aref, D. Lavery, P. Bayvel and L. Schmalen, “Deep Learning for Communication over Dispersive Nonlinear Channels: Performance and Comparison with Classical Digital Signal Processing,” 57th Annual Allerton Conference on Communication, Control, and Computing, Monticello, IL, USA, Nov. 2019
    – Invited Paper –
  10. S. Thai Le, K. Schuh, F. Buchali, X.-Q. Du, M. Grözing, M. Berroth, L. Schmalen and H. Bülow, “16x200 Gbps Virtual Carrier Assisted DD Transmission over 80 km with only 14 GHz of Digitizer Bandwidth,” European Conference on Optical Communications (ECOC), Dublin, Ireland, Sep. 2019
  11. L. Schmalen and V. Aref, “Spatially Coupled LDPC Codes with Non-uniform Coupling for Improved Decoding Speed,” Information Theory Workshop (ITW), Visby, Sweden, Aug. 2019
    – Invited Paper –
  12. S. Thai Le, K. Schuh, R. Dischler, F. Buchali, L. Schmalen and H. Bülow, “5x510 Gbps Single-Polarization Direct-Detection WDM Transmission over 80 km of SSMF,” Optical Fiber Communications Conference (OFC), Paper Tu2B.1, San Diego, CA, USA, Mar. 2019
    – Invited Paper –
  13. K. Klaiber, S. Cammerer, L. Schmalen and S. ten Brink, “Avoiding Burst-like Error Patterns in Windowed Decoding of Spatially Coupled LDPC Codes,” International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Hong Kong, China, Dec. 2018, also available as arXiv:1810.01137
  14. M. Chagnon, B. Karanov and L. Schmalen, “Experimental Demonstration of a Dispersion Tolerant End-to-End Deep Learning-based IM-DD Transmission System,” European Conference on Optical Communications (ECOC), Paper Tu4F.6, Rome, Italy, Sep. 2018
  15. L. Schmalen, “Performance Metrics for Forward Error Correction in Fiber-optic Communication Systems”, European Conference on Optical Communications (ECOC), Paper Th1F.3, Rome, Italy, Sep. 2018
    – Invited Paper –
  16. M. Dia, V. Aref and L. Schmalen, “A Compressed Sensing Approach for Disitribution Matching”, IEEE International Symposium on Information Theory (ISIT), Vail, CO, USA, Jun. 2018, also available as  arXiv:1804.00602
  17. L. Schmalen, “Forward Error Correction for Probabilistic Constellation Shaping: Challenges and Opportunities”, Optical Fiber Communications Conference (OFC), Paper M3C.1, San Diego, CA, USA, Mar. 2018
    – Invited Paper –
  18. F. Buchali, Q. Hu, M. Chagnon, K. Schuh, L. Schmalen and S. Makovejs, “Flexible Transmission Enabled by Novel M2-QAM Formats with Record Distance - Spectral Efficiency Tuneability”, Optical Fiber Communications Conference (OFC), Paper W2A.54, San Siego, CA, USA, Mar. 2018
  19. J. Cho, L. Schmalen and P. Winzer, “Normalized Generalized Mutual Information as a Forward Error Correction Threshold for Probabilistically Shaped QAM”, European Conference on Optical Communications (ECOC), Paper M.2.D.2, Göteborg, Sweden, Sep. 2017
  20. O. Ait Saib, Y. Fernandez de Jauregui Ruiz, A. Ghazisaeidi, P. Plantady, A. Calsat, S. Bubost, L. Schmalen, J. Renaudier, V. Letellier, “Near Capacity 24.6 Tb/s Transmission over 10,285km Straight Line Testbed at 5.9 b/s/Hz Spectral Efficiency Using TPCS-64QAM and C-Band EDFA-Only”, European Conference on Optical Communications (ECOC), Paper Tu.1.E.2, Göteborg, Sweden, Sep. 2017
  21. F. Buchali, W. Idler, R. Dischler, T. A. Eriksson, and L. Schmalen, “Spectrally Efficient Probabilistically Shaped Square 64QAM to 256QAM”, European Conference on Optical Communications (ECOC), Paper Tu.2.D.1, Göteborg, Sweden, Sep. 2017
  22. T. A. Eriksson, M. Chagnon, F. Buchali, K. Schuh, S. ten Brink and L. Schmalen, “56 Gbaud Probabilistically Shaped PAM8 for Data Center Interconnects”, European Conference on Optical Communications (ECOC), Paper Tu.2.D.4, Göteborg, Sweden, Sep. 2017
  23. Q. Hu, R. Dischler, K. Schuh, H. Bülow, L. Schmalen and F. Buchali, “Beating Bandwidth Limitation for High-speed PAM-4 Transmission Based on Turbo Equalizer”, European Conference on Optical Communications (ECOC), Paper P1.SC3.50, Göteborg, Sweden, Sep. 2017
  24. L. Schmalen, T. A. Eriksson, F. Buchali, R. Dischler, and U. Gebhard, “Distributed Transmission and Spatially Coupled Forward Error Correction in Regenerative Multipoint-to-Point Networks”, European Conference on Optical Communications (ECOC), Paper P1.SC3.52, Göteborg, Sweden, Sep. 2017
  25. Q. Hu, F. Buchali, L. Schmalen, W. Idler, R. Dischler, V. Aref and H. Bülow, “Inter-Channel Crosstalk Compensation for Time-Frequency Packing Systems”, European Conference on Optical Communications (ECOC), Paper W.3.E.4, Göteborg, Sweden, Sep. 2017
  26. A. Alvarado, G. Liga, T. Fehenberger and L. Schmalen, “On the Design of Coded Modulation for Fiber Optical Communications”, Workshop on Signal Processing in Photonic Communications (SPPCom), Part of Advanced Photonics, Paper SpM4F.2, New Orleans, LA, USA
    – Invited Paper –     
  27. Q. Hu, F. Buchali, L. Schmalen and H. Bülow, “Experimental Demonstration of Probabilistically Shaped QAM”, Workshop on Signal Processing in Photonic Communications (SPPCom), Part of Advanced Photonics, Paper SpM2F.6, New Orleans, LA, USA
    – Invited Paper –
  28. L. Schmalen, V. Aref and F. Jardel, “Non-Uniformly Coupled LDPC Codes: Better Thresholds, Smaller Rate-loss, and Less Complexity”, IEEE International Symposium on Information Theory (ISIT), Aachen, Germany, Jun. 2017, also available as  arXiv:1701.07629
  29. F. Buchali, W. Idler, L. Schmalen, “Probabilistic Shaping: A Technique for Reach Extension of QAM Systems with Superior Flexibility”, ITG-Fachtagung Photonische Netze (Fachgruppe 5.3), Leipzig, Germany, May 2017
  30. J. Cho, X. Chen, S. Chandrasekhar, G. Raybon, R. Dar, L. Schmalen, E. Burrows, A. Adamiecki, S. Corteselli, Y. Pan, D. Correa, B. McKay, S. Zsigmond, P. Winzer, and S. Grubb, “Trans-Atlantic Field Trial Using Probabilistically Shaped 64-QAM at High Spectral Efficiencies and Single-Carrier Real-Time 250-Gb/s 16-QAM”, Optical Fiber Communications Conference (OFC), Paper Th5B.3, Los Angeles, CA, USA, Mar. 2017
  31. K. Schuh, F. Buchali, W. Idler, T. A. Eriksson, L. Schmalen, W. Templ, L. Altenhain, U. Dümler, R. Schmid, M. Möller, and K. Engenhardt, “Single Carrier 1.2 Tbit/s Transmission over 300 km with PM-64 QAM at 100 GBaud”, Optical Fiber Communications Conference (OFC), Paper Th5B.5, Los Angeles, CA, USA, Mar. 2017
  32. G. Charlet, A, Ghazisaeidi, R. Rios-Müller, J. Renaudier and L. Schmalen, “Signal Processing for Spectrally Efficient Systems”, Optical Fiber Communications Conference (OFC), Paper Th4C.5, Los Angeles, CA, USA, Mar. 2017
    – Invited Paper –
  33. T. A. Eriksson, F. Buchali, and L. Schmalen, “Nonlinear Mitigation using Probabilistically Shaped Real-Valued Modulation Formats”, Optical Fiber Communications Conference (OFC), Paper Th2A.61, Los Angeles, CA, USA, Mar. 2017
  34. T. A. Eriksson, F. Buchali, W. Idler, and L. Schmalen, “Electronically Subcarrier Multiplexed PM-32QAM with Optimized FEC Overhead”, Optical Fiber Communications Conference (OFC), Paper W3J.4, Los Angeles, CA, USA, Mar. 2017
  35. L. Schmalen, L. M. Zhang, and U. Gebhard, “Distributed Rate-Adaptive Staircase Codes for Connectionless Optical Metro Networks”, Optical Fiber Communications Conference (OFC), Paper W1J.2, Los Angeles, CA, USA, Mar. 2017
  36. Q. Hu, F. Buchali, L. Schmalen, W. Idler, R. Dischler, V. Aref and H. Bülow, “Transmit Filter Optimization for Improved Performance of Time-Frequency Packing Systems”, Optical Fiber Communications Conference (OFC), Paper Tu3D.5, Los Angeles, CA, USA, Mar. 2017
  37. F. Buchali, W. Idler, L. Schmalen and Q. Hu, “Flexible Optical Transmission close to the Shannon Limit  by Probabilistically Shaped QAM”, Optical Fiber Communications Conference (OFC), Paper M3C.3, Los Angeles, CA, USA, Mar. 2017
    – Invited Paper –
  38. L. Zhang and L. Schmalen, “Feed-Forward Staircase Codes”, International ITG Conference on Systems, Communications and Coding (SCC), Hamburg, Germany, Feb. 2017, also available as arXiv:1604.06574v2
  39. S. Cammerer, L. Schmalen, V. Aref and S. ten Brink, “Wave-like Decoding of Tail-biting Spatially Coupled LDPC Codes Through Iterative Demapping”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Brest, France, Sep. 2016
  40. V. Aref, N. Rengaswamy and L. Schmalen, “Spatially Coupled LDPC Codes Affected by a Single Random Burst of Erasures”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Brest, France, Sep. 2016
  41. A. Ghazisaeidi, I. Fernandez de Jaregui Ruiz, R. Rios-Müller, L. Schmalen, P. Tran, P. Brindel, A. Carbo Meseguer, Q. Hu, F. Buchali, G. Charlet and J. Renaudier, “65Tb/s Transoceanic Transmission Using Probabilistically-Shaped PDM-64QAM”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  42. W. Idler, F. Buchali, L. Schmalen, E. Lach, R.-P. Braun, G. Böcherer, P. Schulte and F. Steiner, “Field Demonstration of 1 Tbit/s Super-Channel Network Using Probabilistically Shaped Constellations”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  43. L. Schmalen and F. Buchali, “Implicit Constellation Shaping in Regenerative Optical Networks”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  44. L. Schmalen, D. Suikat, V. Aref and D. Rösener, “On the Design of Capacity-Approaching Unit-Memory Spatially Coupled LDPC Codes for Optical Communications”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  45. Q. Hu, F. Buchali, L. Schmalen, W. Idler, R. Dischler and H. Bülow, “Improved Flexibility in Rate and Reach by Time-Frequency Packed QPSK”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  46. R. Dischler, F. Buchali and L. Schmalen, “Embedded In-Band DQPSK Signaling within n-QAM Data Transmission”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  47. F. Buchali, W. Idler, K. Schuh, L. Schmalen, G. Böcherer, F. Steiner, P. Schulte and T. A. Eriksson, “Study of Electrical Subband Multiplexing at 54 GHz Modulation Bandwidth for 16QAM and Probabilistically Shaped 64QAM”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  48. F. Buchali, W. Idler, L. Schmalen, G. Böcherer, P. Schulte and F. Steiner, “Probabilistically Shaped QAM for Independent Reach, Spectral Efficiency and Bit-rate Adaptation”, European Conference on Optical Communications (ECOC), Düsseldorf, Germany, Sep. 2016
  49. S. Cammerer, V. Aref, L. Schmalen and S. ten Brink, “Wave-Like Convergence of Tail-biting Spatially Coupled LDPC Codes”, Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, Mar. 2016, also available as arXiv:1507.01970v2
  50. L. Schmalen, A. Alvarado, and R. Rios-Müller, “Predicting the Performance of Nonbinary Forward Error Correction in Optical Transmission Experiments”, Optical Fiber Communications Conference (OFC), Anaheim, CA, USA, Mar. 2016
  51. R. Rios-Müller, J. Renaudier, L. Schmalen and G. Charlet, “Practical Approaches to 400G Single-Carrier Submarine Transmission”, Optical Fiber Communications Conference (OFC), Paper Th1B.4, Anaheim, CA, USA, Mar. 2016
    –  Invited Paper –
  52. N. Rengaswamy, L. Schmalen, and V. Aref, “On the Burst Erasure Correctability of Spatially Coupled LDPC Ensembles”, International Zurich Seminar on Communications (IZS), Zurich, CH, Mar. 2016
  53. L. Schmalen, D. Suikat, D. Rösener, and V. Aref, “Next-Generation Forward Error Correction: Can We Close the Gap to the Shannon Limit?”, Asia Communications and Photonics Conference (ACP), Hong Kong, Nov. 2015
    –  Invited Paper –
  54. L. Schmalen, “Novel Forward Error Correction Concepts for Coherent Optical Communications”, IEEE Photonics Conference (IPC), Reston, VA, USA, Paper MG4.4, Oct. 2015
    –  Invited Paper –
  55. F. Buchali, G. Böcherer, W. Idler, L. Schmalen, P. Schulte, and F. Steiner, “Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM”, European Conference on Optical Communications (ECOC), Valencia, Spain, Paper PDP3.4, Sep. 2015, also available as arXiv:1509.08836
  56. F. Buchali, L. Schmalen, Q. Hu, and D. Che, “Low Latency Digital Regenerator for Dual Polarization QAM Signals”, European Conference on Optical Communications (ECOC), Valencia, Spain, Paper Mo.3.3.5, Sep. 2015
  57. R. Rios-Müller, J. Renaudier, L. Schmalen, and G. Charlet, “Experimental Comparison between Sub-band Single-Carrier and Superchannel for 400 Gb/s and 800 Gb/s Transport”, European Conference on Optical Communications (ECOC), Valencia, Spain, Paper Tu.1.4.4, Sep. 2015
  58. A. Ghazisaeidi, L. Schmalen, P. Tran, C. Simmoneau, E. Awwad, B. Uscumlic, P. Brindel, and G. Charlet, “54.2 Tb/s Transoceanic Transmission Using Ultra Low Loss Fiber, Multi-rate FEC and Digital Nonlinear Mitigation”, European Conference on Optical Communications (ECOC), Valencia, Spain, Paper Th.2.2.3, Sep. 2015
  59. L. Schmalen, D. Suikat, D. Rösener, V. Aref, A. Leven, and S. ten Brink, “Spatially Coupled Codes and Optical Fiber Communications: An Ideal Match?”, IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Special Session on Signal Processing, Coding, and Information Theory for Optical Communications, Stockholm, Sweden, Jun. 2015, arXiv:1505.05405
  60. J. Cho and L. Schmalen, “Construction of Protographs for Large-Girth Structured LDPC Convolutional Codes”, International Conference on Communications (ICC), London, UK, Jun. 2015
  61. R. Rios-Müller, J. Renaudier, P. Brindel, H. Mardoyan, P. Jennevé, L. Schmalen, and G. Charlet, “1-Terabit/s Net Data-Rate Transceiver Based on Single-Carrier Nyquist-Shaped 124 GBaud PDM-32QAM”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th5B.1, Mar. 2015
  62. J. Renaudier, R. Rios-Müller, L. Schmalen, and G. Charlet, “Spectrally Efficient 1 Tb/s Transceivers”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper M2G.3, Mar. 2015
    –  Invited Paper –
  63. H. Mardoyan, R. Rios-Müller, M. A. Mestre, P. Jennevé, L. Schmalen, A. Ghazisaeidi, P. Tran, S. Bigo, and J. Renaudier, “Transmission of Single-Carrier Nyquist-Shaped 1-Tb/s Line-Rate Signal over 3,000km”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper W3G.2, Mar. 2015
  64. L. Schmalen, S. ten Brink, and A. Leven, “Spatially Coupled LDPC Protograph Codes for Universal Phase Slip-Tolerant Differential Decoding”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th3E.6, Mar. 2015
  65. F. Buchali, W. Idler, L. Schmalen, K. Schuh, and H. Bülow, “Performance and Advantages of 100 Gb/s QPSK/8QAM Hybrid Modulation Formats”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper Th2A.16, Mar. 2015
  66. W. Idler, F. Buchali, L. Schmalen, K. Schuh, and H. Bülow, “Hybrid Modulation Formats Outperforming 16QAM and 8QAM in Transmission Distance and Filtering with Cascaded WSS”, Optical Fiber Communications Conference (OFC), Paper M3G.4, Los Angeles, CA, USA, Mar. 2015
  67. R. Rios-Müller, J. Renaudier, L. Schmalen, and G. Charlet, “Joint Coding Rate and Modulation Format Optimization for 8QAM Constellations Using BICM Mutual Information”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Paper W3K.4, Mar. 2015
  68. A. Ghazisaeidi, L. Schmalen, I. Fernandez de Jauregui, P. Tran, C. Simonneau, P. Brindel, and G. Charlet, “52.9 Tb/s Transmission over Transoceanic Distances using Adaptive Multi-Rate FEC”, European Conference on Optical Communications (ECOC), Cannes, France, Paper PD.3.4, Sep. 2014
  69. R. Rios-Müller, J. Renaudier, P. Brindel, C. Simonneau, P. Tran, A. Ghazisaeidi, I. Fernandez, L. Schmalen, and G. Charlet, “Optimized Spectrally Efficient Transceiver for 400-Gb/s Single Carrier Transport”, European Conference on Optical Communications (ECOC), Cannes, France, Paper PD.4.2, Sep. 2014
  70. L. Schmalen, V. Aref, J. Cho and K. Mahdaviani, “Next Generation Error Correcting Codes for Lightwave Systems”, European Conference on Optical Communications (ECOC), Cannes, France, Th.1.3.3, Sep. 2014
    –  Invited Paper –
  71. L. Schmalen, “Low-Complexity Phase Slip Tolerant LDPC-based FEC Scheme”, European Conference on Optical Communications (ECOC), Cannes, France, Paper Th.2.3.2, Sep. 2014
  72. L. Schmalen, D. Suikat, D. Rösener, and A. Leven, “Evaluation of Left-Terminated Spatially Coupled Codes for Optical Communications”, European Conference on Optical Communications (ECOC), Cannes, France, Paper Th.2.3.4, Sep. 2014
  73. C. R. Müller, A. Leven, H. Bülow, L. Schmalen, G. Leuchs and C. Marquardt, “M-ary Phase Shift Keying Receiver Beating the Standard Quantum Limit for any Signal Power”, European Conference on Optical Communications (ECOC), Cannes, France, Paper P.8.3, Sep. 2014
  74. F. Buchali, L. Schmalen, K. Schuh and W. Idler, “Optimization of Time-Division Hybrid-Modulation and its Application to Rate Adaptive 200Gb Transmission”, European Conference on Optical Communications (ECOC), Cannes, France, Paper Tu.4.3.1, Sep. 2014
  75. J. Renaudier, R. Rios-Müller, L. Schmalen, P. Tran, P. Brindel and G. Charlet, “1-Tb/s PDM-32QAM Superchannel Transmission at 6.7-b/s/Hz over SSMF and 150-GHz-Grid ROADMs”, European Conference on Optical Communications (ECOC), Cannes, France, Paper Tu.3.3.4, Sep. 2014
  76. L. Schmalen and K. Mahdaviani, “Laterally Connected Spatially Coupled Code Chains for Transmission over Unstable Parallel Channels”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Bremen, Germany, Aug. 2014
  77. L. Schmalen, “Energy Efficient FEC for Optical Transmission Systems”, Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Paper M3A.1, Mar. 2014
    – Invited Paper –
  78. F. Buchali, L. Schmalen, A. Klekamp, K. Schuh, and A. Leven, “5 x 50Gb/s WDM Transmission of 32GBaud DP 3 PSK over 36,000 km Fiber with Spatially Coupled LDPC Coding”, Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper, W1A.1
  79. F. Buchali, A. Klekamp, L. Schmalen, and T. Drenski, “Implementation of 64QAM at 42.66 GBaud Using 1.5 Samples per Symbol DAC and Demonstration of up to 300 km Fiber Transmission”, Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper M2A.1
  80. H. Bülow, X. Lu, L. Schmalen, A. Klekamp, and F. Buchali, “Experimental Performance of 4D Optimized Constellation Alternatives for PM-8QAM and PM-16QAM”, Optical Fiber Communications Conference (OFC), San Francisco, CA, USA, Mar. 2014, Paper M2A.6
  81. H. Bülow, X. Lu, and L. Schmalen, “Experimental Analysis of Transmission and Soft Decoding of Optimized 4D Constellations”, Asia Communications and Photonics Conference (ACP), Beijing, China, Nov. 2013
  82. V. Aref, L. Schmalen, and S. ten Brink, “On the Convergence Speed of Spatially Coupled LDPC Ensembles”, Allerton Conference on Communications, Control, and Computing, Monticello, IL, USA, Oct. 2013, arXiv:1307.3780
  83. M. Beermann, E. Monzó, L. Schmalen, and P. Vary, “High Speed Decoding of Non-Binary Irregular LDPC Codes Using GPUs”, IEEE Workshop on Signal Processing Systems (SiPS), Taipei, Taiwan, Oct. 2013
    – Bob Owens Best Student Paper Award –
  84. H. Bülow, X. Lu, and L. Schmalen, “Experimental Analysis of Single Carrier POLQAM (6Pol-QPSK) Transmission with Soft-Decoding”, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  85. R. Dischler and L. Schmalen, “Transmission of a 1.1 Tb/s Super Channel in 100 GHz Optical Bandwidth Based on PM-256 QAM and Spatially Coupled FEC”, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  86. A. Leven and L. Schmalen, “Status and Recent Advances on Forward Error Correction Technologies for Lightwave Systems”, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
    − Invited Tutorial −
  87. J. Renaudier, R. Rios-Muller, L. Schmalen, M. Salsi, P. Tran, G. Charlet, and S. Bigo, “1-Tb/s Transceiver Spanning over just Three 50-GHz Frequency Slots for Long-Haul Systems”, Paper PD2.D.5, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  88. M. Salsi, R. Rios-Muller, J. Renaudier, P. Tran, L. Schmalen, A. Ghazisaeidi, H. Mardoyan, P. Brindel, G. Charlet, and S. Bigo, “38.75 Tb/s Transmission Experiment over Transoceanic Distance”, Paper PD2.E.2, European Conference on Optical Communications (ECOC), London, UK, Sep. 2013
  89. M. Salsi, A. Ghazisaeidi, P. Tran, R. Rios Muller, L. Schmalen, J. Renaudier, H. Mardoyan, P. Brindel, G. Charlet, and S. Bigo, “31 Tb/s Transmission over 7,200km using 46GBaud PDM-8QAM with Optimized Error Correcting Code Rate”, Optoelectronics and Communications Conference (OECC), Kyoto, Japan, Jul. 2013
  90. F. Buchali, K. Schuh, L. Schmalen, W. Idler, E. Lach, and A. Leven, “1-Tbit/s dual-carrier DP 64QAM transmission at 64Gbaud with 40% overhead soft-FEC over 320km SSMF”, Optical Fiber Communications Conference (OFC), Anaheim, CA, USA, Mar. 2013
  91. L. Schmalen and S. ten Brink, “Combining Spatially Coupled Codes with Modulation and Detection”, International ITG Conference on Systems, Communications and Coding (SCC), Munich, Germany, Jan. 2013
  92. L. Schmalen, M. Adrat, T. Clevorn, and P. Vary, “Windowed Iterative Source-Channel Decoding with Delay Constraints”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Gothenburg, Sweden, Aug. 2012
  93. L. Schmalen, S. ten Brink, and A. Leven, “Analysis and Optimization of Iteration Schedules for LDPC Coded Modulation and Detection”, International Symposium on Turbo Codes & Iterative Information Processing (ISTC), Gothenburg, Sweden, Aug. 2012
  94. L. Schmalen, G. Lechner, S. ten Brink, and A. Leven, “On Threshold Prediction of Low-Density Parity-Check Codes With Structure”, Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, Mar. 2012
  95. F. Buchali, K. Schuh, D. Rösener, E. Lach, R. Dischler, W. Idler, L. Schmalen, A. Leven, R.-P. Braun, A. Erhardt, C. Gerlach, L. Schürer, “512 Gb/s DP-16-QAM Field Trial over 734 km Installed SSMF with Co-Propagating 10 Gb/s NRZ Neighbors Incorporating Soft-FEC Decoding”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Mar. 2012
  96. L. Schmalen and R. Dischler, “Experiments Evaluation of Coded Modulation for a Coherent PDM System with High Spectral Efficiency”, Optical Fiber Communications Conference (OFC), Los Angeles, CA, USA, Mar. 2012
  97. Y. Chen, L. Schmalen, H, Bülow, A. Leven, and S. ten Brink, “Space-Time Coding Schemes for Optical MIMO”, European Conference on Optical Communications (ECOC), Paper Tu.6.A.1, Geneva, CH, Sep. 2011
  98. L. Schmalen, M. Tschauner, T. Breddermann, and P. Vary, “Novel Iterative Multiple Description Coding for Correlated Sources”, European Signal Processing Conference (EUSIPCO), Barcelona, Spain, Aug. 2011
  99. M. Beermann, L. Schmalen, and P. Vary, “Improved Decoding of Binary and Non-Binary LDPC by Probabilistic Shuffled Belief Propagation”, IEEE International Conference on Communications (ICC), Kyoto, Japan, Jun. 2011
  100. L.  Schmalen and P. Vary, “Reconstruction of Multiple Descriptions by MMSE Estimation”, ITG Conference on Speech Communication, Bochum, Germany, Oct. 2010
  101. L. Schmalen, P. Vary, T. Clevorn, and M Adrat, “Turbo Source Compression with Jointly Optimized Inner Irregular and Outer Irregular Codes”, IEEE Vehicular Technology Conference (VTC Fall), Ottawa, Canada, Sep. 2010
  102. T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “Hybrid ARQ with Incremental Redundant Index Assignments for Iterative Source-Channel Decoding”, IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 2010
  103. M. Adrat, M. Antweiler, L. Schmalen, P. Vary, and T. Clevorn, “On the Overshooting Effect in EXIT Charts of Iterative Source-Channel Decoding”, IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 2010
  104. L. Schmalen and P. Vary, “Error Resilient Turbo Compression of Source Codec Parameters Using Inner Irregular Codes”, International ITG Conference on Source and Channel Coding (SCC), Siegen, Germany, Jan. 2010
  105. L. Schmalen, T. Schlien, and P. Vary, “The FlexCode Source-Channel Coding Approach for Audio and Speech Transmission”, International ITG Conference on Source and Channel Coding (SCC), Siegen, Germany, Jan. 2010
  106. L. Schmalen and P. Vary, “Near-Lossless Compression and Protection by Turbo Source-Channel (De-) Coding Using Irregular Index Assignments”, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Taipei, Taiwan, Apr. 2009
  107. H. Lüders, B. Eschbach, L. Schmalen, and P. Vary, “OFDM Turbo DeCodulation with EXIT Optimized Bit Loading and Signal Constellations”, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Taipei, Taiwan, Apr. 2009
  108. L. Schmalen, P. Vary, and M. Adrat, “Reduced-Search Source Decoders for Iterative Source-Channel Decoding”, ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  109. L. Schmalen, B. Schotsch, M. Jeub, P. Vary, and T. Clevorn, “The FlexCode Channel Coding Approach”, ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  110. T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “Iterative Source-Channel Decoding: Design of Redundant Index Assignments”, ITG Conference on Speech Communication, Aachen, Germany, Oct. 2008
  111. L. Schmalen, P. Vary, M. Adrat, and T. Clevorn, “Complexity-Reduced Iterative Source-Channel Decoding by Conditional Quantization”, International Symposium on Turbo Codes & Related Topics (ISTC), Lausanne, CH, Sep. 2008
  112. R. Thobaben, L. Schmalen, and P. Vary, “Joint Source-Channel Coding with Inner Irregular Codes”, in IEEE International Symposium on Information Theory (ISIT), Toronto, Canada, Jul. 2008
  113. B. Schotsch, L. Schmalen, P. Vary, and T. Clevorn, “Graph-Based Turbo DeCodulation with LDPC Codes”, Vehicular Technology Conference (VTC Spring), Singapore, May 2008
  114. L. Schmalen, P. Vary, T. Clevorn, and B. Schotsch, “Efficient Iterative Source-Channel Decoding Using Irregular Index Assignments”, International ITG Conference on Source and Channel Coding (SCC), Ulm, Germany, Jan. 2008
  115. H. Lüders, L. Schmalen, and P. Vary, “Approximating EXIT Characteristics of Soft Demodulators in OFDM BICM-ID Systems for Time Variant Frequency Selective Fading Channels”, International ITG Conference on Source and Channel Coding (SCC), Ulm, Germany, Jan. 2008
  116. L. Schmalen, P. Vary, M. Adrat, and T. Clevorn, “On the EXIT Characteristics of Feed Forward Convolutional Codes”, IEEE International Symposium on Information Theory (ISIT), Nice, France, Jun. 2007
  117. L. Schmalen, T. Clevorn, and P. Vary, “Iterative Source-Coded Equalization: Turbo Error Concealment for ISI Channels”, IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Helsinki, Finland, Jun. 2007
  118. T. Clevorn, L. Schmalen, P. Vary, and M. Adrat, “On the Optimum Performance Theoretically Attainable for Scalarly Quantized Correlated Sources”, International Symposium on Information Theory and its Applications (ISITA), Seoul, Korea, Oct. 2006
  119. T. Clevorn, B. Schotsch, L. Schmalen, P. Vary, and M. Adrat, “Separation of Recursive Convolutional Codes into Sub-Codes using Galois Field Arithmetic”, Conference on Information Sciences and Systems (CISS), Princeton, NJ, USA, Mar. 2006
  120. L. Schmalen and M. Adrat, “An Iterative, Turbo-like Approach to Convolutional Decoding”, 9th International Student Conference on Electrical Engineering, Prague, Czech Republic, May 2005