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
On the Performance of Probabilistic Shaped 16-QAM with different Entropies using Probability-aided Maximum Likelihood Sequence Detector
TL;DR: In this paper , the performance of probabilistic shaped 16-ary quadrature amplitude modulation (PS-16QAM) with different entropies is investigated using the optimal probability-aided maximum likelihood sequence detector (PMLSD), which could effectively alleviate some adverse impacts of PS technology on the decision module.
Journal ArticleDOI
Advanced Digital Signal Processing and Variable-Rate Coding for Unrepeatered Optical Transmission
TL;DR: In this paper , a selective combination of algorithms for fiber nonlinearity compensation, transceiver impairments mitigation and variable-rate coding in unrepeatered optical transmission is evaluated. And the experimental results for different combinations of algorithms elucidate the trade-off of complexity and performance in uncompensated optical transmission.
Proceedings ArticleDOI
A Poldemux Scheme Using Extended Kalman Filter in Probabilistic Shaping Stokes Vector Direct Detection System
TL;DR: A Kalman filter based PolDemux scheme to cope with probabilistically shaped 16QAM signals in Stokes vector direct detection system can track the SOP variation up to 2Mrad/s at a relative lower OSNR.
Proceedings ArticleDOI
Research on the Pilot-Aided Kalman filter Carrier Phase Recovery algorithm for PS-64QAM
TL;DR: In this paper , a pilot-aided Kalman filter (PA-KF) carrier phase recovery (CPR) scheme for PS-64QAM was proposed, which reduced the complexity by 99% and the general mutual information (GMI) increased by 1.18 bit/symbol compared with blind search algorithm.
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.