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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Posted Content
Hierarchical Distribution Matching: a Versatile Tool for Probabilistic Shaping
Stella Civelli,Marco Secondini +1 more
TL;DR: The hierarchical distribution matching (Hi-DM) approach for probabilistic shaping is described and the potential of Hi-DM in terms of trade-off between performance, complexity, and memory is illustrated through three case studies.
Proceedings ArticleDOI
Rate-Adaptive Coded Modulation with Geometrically-shaped Constellations
TL;DR: Information-theoretic metrics are used to design rate-adaptive coded modulation based on geometrically-shaped constellations with soft- and hard-decision FEC and results show that an 8% reach extension can be achieved with flexible data rates and transmission distances.
Book ChapterDOI
Ultralong-distance undersea transmission systems
TL;DR: This chapter introduces the Gaussian noise model, discusses generalized optical signal-to-noise ratio, and presents the “open cable” concept, and focuses on technologies to combat fiber nonlinearities and achieve high capacity in single-mode fiber.
Proceedings ArticleDOI
Enumerative Sphere Shaping for Rate Adaptation and Reach Increase in WDM Transmission Systems
Abdelkerim Amari,Sebastiaan Goossens,Yunus Can Gultekin,Olga Vassilieva,Inwoong Kim,Tadashi Ikeuchi,Chigo Okonkwo,Frans M. J. Willems,Alex Alvarado +8 more
TL;DR: The performance of enumerative sphere shaping (ESS), constant composition distribution matching (CCDM), and uniform signalling are compared at the same forward error correction rate as discussed by the authors, and ESS is shown to offer a reach increase of approximately 10% and 22% compared to CCDM and uniform signaling, respectively.
Journal ArticleDOI
On the Fairness of the Performance Evaluation of Probabilistically Shaped QAM Signals
TL;DR: It is demonstrated that unrealistically large system gains and improved tolerance to fiber Kerr nonlinearity of PS-QAM can be observed under second condition due to different IRs, and recommended to use “the same IR” condition for comparison and the estimation of system gains by PS-MQAM.
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.