Journal ArticleDOI
Rate Adaptation and Reach Increase by Probabilistically Shaped 64-QAM: An Experimental Demonstration
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TLDR
A transmission system with adjustable data rate for single-carrier coherent optical transmission is proposed, which enables high-speed transmission close to the Shannon limit, and it is experimentally demonstrated that the optical transmission of probabilistically shaped 64-QAM signals outperforms the transmission reach of regular 16- QAM and regular 64-ZAM signals.Abstract:
A transmission system with adjustable data rate for single-carrier coherent optical transmission is proposed, which enables high-speed transmission close to the Shannon limit. The proposed system is based on probabilistically shaped 64-QAM modulation formats. Adjustable shaping is combined with a fixed-QAM modulation and a fixed forward-error correction code to realize a system with adjustable net data rate that can operate over a large reach range. At the transmitter, an adjustable distribution matcher performs the shaping. At the receiver, an inverse distribution matcher is used. Probabilistic shaping is implemented into a coherent optical transmission system for 64-QAM at 32 Gbaud to realize adjustable operation modes for net data rates ranging from 200 to 300 Gb/s. It is experimentally demonstrated that the optical transmission of probabilistically shaped 64-QAM signals outperforms the transmission reach of regular 16-QAM and regular 64-QAM signals by more than 40% in the transmission reach.read more
Citations
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Proceedings ArticleDOI
Multi-Rate Prefix-Free Code Distribution Matching
Junho Cho,Peter J. Winzer +1 more
TL;DR: This work proposes a multi-rate prefix-free code distribution matching algorithm that implements a fixed-length probabilistic constellation shaping that uses various small codebooks in an adaptive manner, thereby improving the shaping performance of PCDM.
Proceedings ArticleDOI
Probabilistically Shaped 256-QAM-OFDM Transmission in Underwater Wireless Optical Communication System
TL;DR: This is the first time to employ PS-QAM in UWOC for 35m underwater-wireless-optical-communication (UWOC) system and compared with bit-power loading scheme, 27.8% capacity improvement is achieved.
Journal ArticleDOI
Throughput Gains From Adaptive Transceivers in Nonlinear Elastic Optical Networks
TL;DR: It is shown that the expected gain in the network throughput due to transceiver adaptation is equivalent to the gain in a point-to-point link with a length equal to the mean length of the optical paths across the minimum network cut.
Proceedings ArticleDOI
Multilevel Coding with Flexible Probabilistic Shaping for Rate-Adaptive and Low-Power Optical Communications
TL;DR: A novel multilevel coded modulation scheme with probabilistic shaping that can reduce the power consumption up to 9 times compared with uniform signaling in the regime of typical hard-decision FEC thresholds is presented.
Journal ArticleDOI
Supply-Power-Constrained Cable Capacity Maximization Using Multi-Layer Neural Networks
Junho Cho,Sethumadhavan Chandrasekhar,Erixhen Sula,Samuel L. I. Olsson,Ellsworth Burrows,G. Raybon,Roland Ryf,Nicolas K. Fontaine,Jean-Christophe Antona,Steve Grubb,Peter J. Winzer,Andrew R. Chraplyvy +11 more
TL;DR: This work experimentally solves the problem of maximizing capacity under a total supply power constraint in a massively parallel submarine cable context and conjecture that the capacity surface is a concave function of the transmit signal power distribution, and demonstrates that eliminating gain flattening filters from the optical amplifiers results in substantial capacity gains.
References
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Book
Information Theory and Reliable Communication
TL;DR: This chapter discusses Coding for Discrete Sources, Techniques for Coding and Decoding, and Source Coding with a Fidelity Criterion.
Journal ArticleDOI
Capacity Limits of Optical Fiber Networks
TL;DR: In this article, the capacity limit of fiber-optic communication systems (or fiber channels?) is estimated based on information theory and the relationship between the commonly used signal to noise ratio and the optical signal-to-noise ratio is discussed.
Journal ArticleDOI
Threshold Saturation via Spatial Coupling: Why Convolutional LDPC Ensembles Perform So Well over the BEC
TL;DR: The fundamental mechanism that explains why “convolutional-like” or “spatially coupled” codes perform so well is described, and it is conjecture that for a large range of graphical systems a similar saturation of the “dynamical” threshold occurs once individual components are coupled sufficiently strongly.
Journal ArticleDOI
Bandwidth Efficient and Rate-Matched Low-Density Parity-Check Coded Modulation
TL;DR: A new coded modulation scheme is proposed that operates within less than 1.1 dB of the AWGN capacity 1/2 log2(1 + SNR) at any spectral efficiency between 1 and 5 bits/s/Hz by using only 5 modes.