Fred Buchali
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View article: A Novel Phenomenological Model of Equalization-enhanced Phase Noise
A Novel Phenomenological Model of Equalization-enhanced Phase Noise Open
We show that equalization-enhanced phase noise manifests as a time-varying, frequency-dependent phase error, which can be modeled and reversed by a time-varying all-pass finite impulse response filter.
View article: Improving the Bootstrap of Blind Equalizers with Variational Autoencoders
Improving the Bootstrap of Blind Equalizers with Variational Autoencoders Open
We evaluate the start-up of blind equalizers at critical working points, analyze the advantages and obstacles of commonly-used algorithms, and demonstrate how the recently-proposed variational autoencoder (VAE) based equalizers can improve…
View article: Blind Equalization and Channel Estimation in Coherent Optical Communications Using Variational Autoencoders
Blind Equalization and Channel Estimation in Coherent Optical Communications Using Variational Autoencoders Open
We investigate the potential of adaptive blind equalizers based on variational inference for carrier recovery in optical communications. These equalizers are based on a low-complexity approximation of maximum likelihood channel estimation.…
View article: Ultrahigh-Net-Bitrate 363 Gbit/s PAM-8 and 279 Gbit/s Polybinary Optical Transmission Using Plasmonic Mach-Zehnder Modulator
Ultrahigh-Net-Bitrate 363 Gbit/s PAM-8 and 279 Gbit/s Polybinary Optical Transmission Using Plasmonic Mach-Zehnder Modulator Open
We summarize our experimental exploration of the capabilities of an ultrabroad-bandwidth plasmonic Mach-Zehnder modulator (MZM), in an intensity modulation and direct detection (IM/DD) system for short-reach optical transmission up to 10 k…
View article: Deep Neural Network-Based Digital Pre-Distortion for High Baudrate Optical Coherent Transmission
Deep Neural Network-Based Digital Pre-Distortion for High Baudrate Optical Coherent Transmission Open
High-symbol-rate coherent optical transceivers suffer more from the critical responses of transceiver components at high frequency, especially when applying a higher order modulation format. Recently, we proposed in [20] a neural network (…
View article: Plasmonic-MZM-based Short-Reach Transmission up to 10 km Supporting >304 GBd Polybinary or 432 Gbit/s PAM-8 Signaling
Plasmonic-MZM-based Short-Reach Transmission up to 10 km Supporting >304 GBd Polybinary or 432 Gbit/s PAM-8 Signaling Open
We employ an ultrabroad-bandwidth plasmonic Mach-Zehnder modulator to demonstrate 10-km IM/DD transmission at a symbol rate of 304-GBd (AIR 293.3-Gbit/s, net 270.0-Gbit/s) realized with a poly-binary modulation scheme, and a line rate of 4…
View article: On the Comparison of Single-Carrier vs. Digital Multi-Carrier Signaling for Long-Haul Transmission of Probabilistically Shaped Constellation Formats
On the Comparison of Single-Carrier vs. Digital Multi-Carrier Signaling for Long-Haul Transmission of Probabilistically Shaped Constellation Formats Open
We report on theoretical and experimental investigations of the nonlinear tolerance of single carrier and digital multicarrier approaches with probabilistically shaped constellations. Experimental transmission of PCS16QAM is assessed at 12…
View article: SiGe HBTs and BiCMOS Technology for Present and Future Millimeter-Wave Systems
SiGe HBTs and BiCMOS Technology for Present and Future Millimeter-Wave Systems Open
International audience
View article: Exploring and Experimenting With Shaping Designs for Next-Generation Optical Communications
Exploring and Experimenting With Shaping Designs for Next-Generation Optical Communications Open
A class of circular 64-QAM that combines 'geometric' and 'probabilistic'\nshaping aspects is presented. It is compared to square 64-QAM in back-to-back,\nsingle-channel, and WDM transmission experiments. First, for the linear AWGN\nchannel…
View article: Experiments and Shaping Tradeoffs for Long-Haul Transmissions.
Experiments and Shaping Tradeoffs for Long-Haul Transmissions. Open
A class of circular 64-QAM that combines 'geometric' and 'probabilistic' shaping aspects is presented. It is compared to square 64-QAM in back-to-back, single-channel, and WDM transmission experiments. First, for the linear AWGN channel mo…
View article: Distributed Transmission and Spatially Coupled Forward Error Correction in Regenerative Multipoint-to-Point Networks
Distributed Transmission and Spatially Coupled Forward Error Correction in Regenerative Multipoint-to-Point Networks Open
We investigate the performance of coded modulation for multi-hop regenerative optical networks. We analyze options for computing decoder input LLRs, show reach increases by optimized regenerator placement and experimentally compare strateg…
View article: Higher-Order Modulation Formats – Concepts and Enabling Devices
Higher-Order Modulation Formats – Concepts and Enabling Devices Open
The chapter gives a general introduction to higher-order modulation (HOM) formats and reviews the current status of concepts of coherent transceivers applied in optical fiber communications. The chapter presents an overview on the major en…
View article: Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM
Experimental Demonstration of Capacity Increase and Rate-Adaptation by Probabilistically Shaped 64-QAM Open
We implemented a flexible transmission system operating at adjustable data rate and fixed bandwidth, baudrate, constellation and overhead using probabilistic shaping. We demonstrated in a transmission experiment up to 15% capacity and 43% …