Optical OFDM: A promising high-speed optical transport technology. - Fred Buchali; Roman Dischler; Xiang Liu (Bell Labs Tech. J., 2009)

Mitigation of fiber nonlinear impairments in polarization division multiplexed OFDM transmission. - Xiang Liu 018; Fred Buchali; Robert W. Tkach; Sethumadhavan Chandrasekhar (Bell Labs Tech. J., 2010)

Quantifying Spectrum, Cost, and Energy Efficiency in Fixed-Grid and Flex-Grid Networks [Invited]. - Eleni Palkopoulou; Marianna Angelou; Dimitrios Klonidis; Konstantinos Christodoulopoulos; Axel Klekamp; Fred Buchali; Emmanouel A. Varvarigos; Ioannis Tomkos (JOCN, 2012)

1-Tbit/s dual-carrier DP 64QAM transmission at 64Gbaud with 40% overhead soft-FEC over 320km SSMF. - Fred Buchali; Karsten Schuh; Laurent Schmalen; Wilfried Idler; Eugen Lach; Andreas Leven (OFC/NFOEC, 2013)

Transmission of 4-D modulation formats at 28-Gbaud. - Henning Bülow; Talha Rahman; Fred Buchali; Wilfried Idler; Wolfgang Kuebart (OFC/NFOEC, 2013)

Spectral pre-distortion with FPGA and DAC at 448-Gb/s DP-16QAM improving nonlinear threshold power. - Wilfried Idler; Fred Buchali; Karsten Schuh; Detlef Roesener; Eugen Lach; Andreas Leven (OFC/NFOEC, 2013)

Optimization of time-division hybrid-modulation and its application to rate adaptive 200Gb transmission. - Fred Buchali; Laurent Schmalen; Karsten Schuh; Wilfried Idler (ECOC, 2014)

Compensation of fiber nonlinearities for 32 Gbaud 16QAM and QPSK transmission. - Karsten Schuh; Fred Buchali (ECOC, 2014)

Implementation of 64QAM at 42.66 GBaud using 1.5 samples per symbol DAC and demonstration of up to 300 km fiber transmission. - Fred Buchali; Axel Klekamp; Laurent Schmalen; Tomislav Drenski (OFC, 2014)

5 × 50 Gb/s WDM transmission of 32 Gbaud DP-3-PSK over 36, 000 km fiber with spatially coupled LDPC coding. - Fred Buchali; Laurent Schmalen; Axel Klekamp; Karsten Schuh; Andreas Leven (OFC, 2014)

Experimental performance of 4D optimized constellation alternatives for PM-8QAM and PM-16QAM. - Henning Bülow; Xiaofeng Lu; Laurent Schmalen; Axel Klekamp; Fred Buchali (OFC, 2014)

1 Tb/s - 4×343 Gb/s subcarriers on 50GHz grid - transmission over 480 km SMF with 22 GHz bandwidth semiconductor modulator. - Wilfried Idler; Fred Buchali; Karsten Schuh; N. Cameron; Tino Brast; S. Schmid; Andreas G. Steffan (OFC, 2014)

Experimental demonstration of capacity increase and rate-adaptation by probabilistically shaped 64-QAM. - Fred Buchali; Georg Böcherer; Wilfried Idler; Laurent Schmalen; Patrick Schulte; Fabian Steiner (ECOC, 2015)

Low latency digital regenerator for dual polarization QAM signals. - Fred Buchali; Laurent Schmalen; Qian Hu; Di Che (ECOC, 2015)

4D-CMA: Enabling separation of channel compensation and polarization demultiplex. - Fred Buchali; Henning Bülow; Karsten Schuh; Wilfried Idler (OFC, 2015)

Performance and advantages of 100 Gb/s QPSK/8QAM hybrid modulation formats. - Fred Buchali; Wilfried Idler; Laurent Schmalen; Karsten Schuh (OFC, 2015)

Hybrid modulation formats outperforming 16QAM and 8QAM in transmission distance and filtering with cascaded WSS. - Wilfried Idler; Fred Buchali; Laurent Schmalen; Karsten Schuh; Henning Bülow (OFC, 2015)

Preemphased prime frequency multicarrier bases ENOB assessment and its application for optimizing a dual-carrier 1-Tb/s QAM transmitter. - Fred Buchali; Wilfried Idler; Nazanin Rastegardoost; Tomislav Drenski; R. Ward; L. Zhao (OFC, 2016)

Experimental study of symbol-rates and MQAM formats for single carrier 400 Gb/s and few carrier 1 Tb/s options. - Wilfried Idler; Fred Buchali; Karsten Schuh (OFC, 2016)

Spectrally Efficient Probabilistically Shaped Square 64QAM to 256 QAM. - Fred Buchali; Wilfried Idler; Roman Dischler; Tobias A. Eriksson; Laurent Schmalen (ECOC, 2017)

Single Carrier 168 Gb/s PAM8 over 80 km Below HD-FEC Using Simple Receiver Equalization for Data Centre Interconnects. - Mathieu Chagnon; Tobias A. Eriksson; Fred Buchali; Henning Bülow; Stephan ten Brink (ECOC, 2017)

Duobinary IQ Modulation Schemes for C- and O-band PAM4 Direct Detect Systems. - Mathieu Chagnon; Tobias A. Eriksson; Roman Dischler; Fred Buchali; Henning Bülow; Stephan ten Brink (ECOC, 2017)

Experimental Investigation of the Impact of Minimizing Fourth-order Modulation Factor using Dispersion Optimization. - Tobias A. Eriksson; Fred Buchali (ECOC, 2017)

56 Gbaud Probabilistically Shaped PAM8 for Data Center Interconnects. - Tobias A. Eriksson; Mathieu Chagnon; Fred Buchali; Karsten Schuh; Stephan ten Brink; Laurent Schmalen (ECOC, 2017)

Inter-Channel Crosstalk Compensation for Time-Frequency Packing Systems. - Qian Hu; Fred Buchali; Laurent Schmalen; Wilfried Idler; Roman Dischler; Vahid Aref; Henning Bülow (ECOC, 2017)

Beating Bandwidth Limitation for High-speed PAM-4 Transmission Based on Turbo Equalizer. - Qian Hu; Roman Dischler; Karsten Schuh; Henning Bülow; Laurent Schmalen; Fred Buchali (ECOC, 2017)

Experimental Comparison of 64-QAM and Combined Geometric-Probabilistic Shaped 64-QAM. - Fanny Jardel; Tobias A. Eriksson; Fred Buchali; Wilfried Idler; Amirhossein Ghazisaeidi; Cyril Measson; Joseph J. Boutros (ECOC, 2017)

8×256Gbps Virtual-Carrier Assisted WDM Direct-Detection Transmission over a Single Span of 200km. - Son T. Le; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Roman Dischler; Vahid Aref; Henning Bülow; Klaus M. Engenhardt (ECOC, 2017)

Distributed Transmission and Spatially Coupled Forward Error Correction in Regenerative Multipoint-to-Point Networks. - Laurent Schmalen; Tobias A. Eriksson; Fred Buchali; Roman Dischler; Ulrich Gebhard (ECOC, 2017)

Flexible optical transmission close to the Shannon limit by probabilistically shaped QAM. - Fred Buchali; Wilfried Idler; Laurent Schmalen; Qian Hu (OFC, 2017)

Electronically subcarrier multiplexed PM-32QAM with optimized FEC overheads. - Tobias A. Eriksson; Fred Buchali; Wilfried Idler; Laurent Schmalen; Gabriel Charlet (OFC, 2017)

Nonlinear mitigation using probabilistically shaped real-valued modulation formats. - Tobias A. Eriksson; Fred Buchali; Laurent Schmalen (OFC, 2017)

Transmit filter optimization for improved performance of time-frequency packing systems. - Qian Hu; Fred Buchali; Laurent Schmalen; Wilfried Idler; Roman Dischler; Vahid Aref; Henning Bülow (OFC, 2017)

Single carrier 1.2 Tbit/s transmission over 300 km with PM-64 QAM at 100 GBaud. - Karsten Schuh; Fred Buchali; Wilfried Idler; Tobias A. Eriksson; Laurent Schmalen; Wolfgang Templ; Lars Altenhain; Ulrich Dumler; Rolf Schmid; Michael Möller 004; Klaus Engenhardt (OFC, 2017)

800 Gbit/s dual channel transmitter with 1.056 Tbit/s gross rate. - Karsten Schuh; Fred Buchali; Wilfried Idler; Tobias A. Eriksson; Wolfgang Templ; Lars Altenhain; Ulrich Dumler; Rolf Schmid; Michael Möller 004 (OFC, 2017)

Amplifier Less 400 Gb/s Coherent Transmission at Short Reach. - Fred Buchali; Mathieu Chagnon; Karsten Schuh; Po Dong; Henning Bülow (ECOC, 2018)

3.6-Tbps Duobinary 16-QAM Transmission with Improved Tolerance to Cascaded ROADM Filtering Penalty. - Qian Hu; Fred Buchali; Mathieu Chagnon; Karsten Schuh; Henning Bülow (ECOC, 2018)

Up to 94 GBd THP PAM-4 Transmission with 33 GHz Bandwidth Limitation. - Qian Hu; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Henning Bülow (ECOC, 2018)

50 Gb/s PAM-4 Transmission Over 80-km SSMF Without Dispersion Compensation. - Qian Hu; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Son Thai Le; Henning Bülow (ECOC, 2018)

1.53-Tbps CPRI-Equivalent Data Rate Transmission with Kramers-Kronig Receiver for Mobile Fronthaul Links. - Son Thai Le; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Henning Bülow (ECOC, 2018)

Flexible Transmission Enabled by Novel M2-QAM Formats with Record Distance - Spectral Efficiency Tuneability. - Fred Buchali; Qian Hu; Mathieu Chagnon; Karsten Schuh; Laurent Schmalen; Sergejs Makovejs (OFC, 2018)

Transmitter-side Volterra Filtering for Increased Dispersion Tolerance in 56 Gbaud PAM-4 Systems. - Jokhakar Jignesh; Tobias A. Eriksson; Mathieu Chagnon; Bill Corcoran; Arthur James Lowery; Fred Buchali; Henning Bülow (OFC, 2018)

100 Gbps b-modulated Nonlinear Frequency Division Multiplexed Transmission. - Son T. Le; Karsten Schuh; Fred Buchali; Henning Bülow (OFC, 2018)

1.6Tbps WDM Direct Detection Transmission with Virtual-Carrier over 1200km. - Son Thai Le; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Henning Bülow (OFC, 2018)

Experiments and Shaping Tradeoffs for Long-Haul Transmissions. - Fanny Jardel; Tobias A. Eriksson; Cyril Méasson; Amirhossein Ghazisaeidi; Fred Buchali; Wilfried Idler; Joseph J. Boutros (CoRR, 2018)

Transmission Link Optimization for Coherent 4 Tb/s Extended Reach (ZR) Transmission. - Fred Buchali; Mathieu Chagnon; Karsten Schuh (OFC, 2019)

A SiGe HBT BiCMOS 1-to-4 ADC Frontend Supporting 100 GBaud PAM4 Reception at 14 GHz Digitizer Bandwidth. - Fred Buchali; Karsten Schuh; Son Thai Le; Xuan-Quang Du; Markus Grozing; Manfred Berroth (OFC, 2019)

84 GBd Faster-Than-Nyquist PAM-4 Transmission using Only Linear Equalizer at Receiver. - Qian Hu; Karsten Schuh; Mathieu Chagnon; Fred Buchali; Henning Bülow (OFC, 2019)

5×510 Gbps Single-Polarization Direct-Detection WDM Transmission over 80 km of SSMF. - Son Thai Le; Karsten Schuh; Roman Dischler; Fred Buchali; Laurent Schmalen; Henning Bülow (OFC, 2019)

Transmission of 90 Gbd 32 QAM Over 480 km of SSMF with Kramers-Kronig Detection. - Karsten Schuh; Son Thai Le; Roman Dischler; Fred Buchali (OFC, 2019)

Single-channel 1.61 Tb/s Optical Coherent Transmission Enabled by Neural Network-Based Digital Pre-Distortion. - Vinod Bajaj; Fred Buchali; Mathieu Chagnon; Sander Wahls; Vahid Aref (ECOC, 2020)

52.1 Tb/s C-band DCI transmission over DCI distances at 52.1 Tb/s C-Band DCI Transmission over DCI Distances at 1.49 Tb/s/λ.49 Tbsλ. - Fred Buchali; Vahid Aref; Mathieu Chagnon; Roman Dischler; Horst Hettrich; Rolf Schmid; Michael Möller 004 (ECOC, 2020)

120 Gbaud IM/DD PAM-4 Transmission over 1.5 km SMF Using a Single CMOS DAC with <20 GHz Analog Bandwidth. - Qian Hu; Karsten Schuh; Robert Borkowski; Fred Buchali; Henning Bülow (ECOC, 2020)

Optical Single-Sideband Direct Detection Transmissions: Recent Progress and Commercial Aspects. - Son T. Le; Karsten Schuh; Fred Buchali; Tomislav Drenski; Andrew Hills; Malcom King; Tod Sizer (ECOC, 2020)

100 GSa/s BiCMOS Analog Multiplexer Based 100 GBd PAM Transmission over 20 km Single-Mode Fiber in the C-Band. - Karsten Schuh; Qian Hu; Michael Collisi; Roman Dischler; Mathieu Chagnon; Fred Buchali; Horst Hettrich; Rolf Schmid; Michael Möller 004 (ECOC, 2020)

1.52 Tb/s Single Carrier Transmission Supported by a 128 GSa/s SiGe DAC. - Fred Buchali; Vahid Aref; Mathieu Chagnon; Karsten Schuh; Horst Hettrich; Anna Bielik; Lars Altenhain; Markus Guntermann; Rolf Schmid; Michael Möller 004 (OFC, 2020)

1.1 Tb/s/λ at 9.8 Bit/s/Hz DWDM Transmission over DCI Distances Supported by CMOS DACs. - Fred Buchali; Vincent Lauinger; Mathieu Chagnon; Karsten Schuh; Vahid Aref (OFC, 2020)

Novel Optical Field Reconstruction for IM/DD with Receiver Bandwidth Well below Full Optical Signal Bandwidth. - Qian Hu; Robert Borkowski; Mathieu Chagnon; Karsten Schuh; Fred Buchali; Henning Bülow (OFC, 2020)

49.2-Tbit/s WDM Transmission over 2×93-km Field-Deployed Fiber. - Karsten Schuh; Fred Buchali; Roman Dischler; Mathieu Chagnon; Vahid Aref; Henning Bülow; Qian Hu; Florian Pulka; Massimo Frascolla; Esmaeel Alhammadi; Adel Samhan; Islam Younis; et al. (OFC, 2020)

Plasmonic-MZM-based Short-Reach Transmission up to 10 km Supporting >304 GBd Polybinary or 432 Gbit/s PAM-8 Signaling. - Qian Hu; Robert Borkowski; Yannick Lefevre; Fred Buchali; René Bonk; Karsten Schuh; Eva de Leo; Patrick Habegger; Marcel Destraz; Nino Del Medico; Hamit Duran; Valentino Tedaldi; et al. (ECOC, 2021)

High-speed IM/DD transmission with analog (de-)multiplexers. - Karsten Schuh; Qian Hu; Roman Dischler; Vahid Aref; Fred Buchali; Son Thai Le; Michael Collisi; Michael Möller 004; Horst Hettrich; Rolf Schmid; Xuan-Quang Du; Markus Grözing; et al. (ECOC, 2021)

54.5 Tb/s WDM Transmission over Field Deployed Fiber Enabled by Neural Network-Based Digital Pre-Distortion. - Vinod Bajaj; Fred Buchali; Mathieu Chagnon; Sander Wahls; Vahid Aref (OFC, 2021)

On the Comparison of Single-Carrier vs. Digital Multi-Carrier Signaling for Long-Haul Transmission of Probabilistically Shaped Constellation Formats. - Kaoutar Benyahya; Amirhossein Ghazisaeidi; Vahid Aref; Mathieu Chagnon; Aymeric Arnould; Stenio Ranzini; Haïk Mardoyan; Fred Buchali; Jeremie Renaudier (OFC, 2021)

Beyond 1 Tbit/s transmission using high-speed DACs and analog multiplexing. - Fred Buchali (OFC, 2021)

120 GSa/s BiCMOS Analog Multiplexer Enabling 360 Gbit/s DSCM-PCS-256QAM IM/DD Transmission. - Qian Hu; Karsten Schuh; Michael Collisi; Vahid Aref; Horst Hettrich; Rolf Schmid; Fred Buchali; Michael Möller 004 (OFC, 2021)

Neural-Network-Based Nonlinearity Equalizer for 128 GBaud Coherent Transcievers. - Vladislav Neskorniuk; Fred Buchali; Vinod Bajaj; Sergei K. Turitsyn; Jaroslaw E. Prilepsky; Vahid Aref (OFC, 2021)

1-to-4 Analog Demultiplexer With up to 128 GS/s for Interleaving of Bandwidth-Limited Digitizers in Wireline and Optical Receivers. - Philipp Thomas; Tobias Tannert; Markus Grözing; Manfred Berroth; Qian Hu; Fred Buchali (IEEE J. Solid State Circuits, 2021)

Experimental Evaluation of PAM and Polybinary Modulation for Intra-DCI Optical Lanes with up to 300 Gbit/s Net Bitrates. - Robert Borkowski; Qian Hu; Yannick Lefevre; Fred Buchali; René Bonk; Karsten Schuh; Junho Cho; Juerg Leuthold; Wolfgang Heni; Benedikt Baeuerle; Claudia Hoessbacher (OFC, 2022)

Blind Equalization and Channel Estimation in Coherent Optical Communications Using Variational Autoencoders. - Vincent Lauinger; Fred Buchali; Laurent Schmalen (IEEE J. Sel. Areas Commun., 2022)

Improving the Bootstrap of Blind Equalizers with Variational Autoencoders. - Vincent Lauinger; Fred Buchali; Laurent Schmalen (OFC, 2023)

467 Gbit/s Net Bitrate IM/DD Transmission Using 176 GBd PAM-8 Enabled by SiGe AMUX with Excellent Linearity. - Qian Hu; Tobias Tannert; Markus Grözing; Gregory Raybon; Robert Borkowski; Fred Buchali; Xi Chen 018; Patrick Iannone; Georg Rademacher; Roland Ryf (OFC, 2024)

Demonstration of Linear and Nonlinear SNR Estimation Using a Commercial Transponder. - Vinod Bajaj; Fred Buchali; Fabien Boitier; Petros Ramantanis; Vahid Aref; Patricia Layec (OFC, 2025)

A Novel Phenomenological Model of Equalization-enhanced Phase Noise. - Benedikt Geiger; Fred Buchali; Vahid Aref; Laurent Schmalen (OFC, 2025)