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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Journal ArticleDOI
Performance Prediction of Nonbinary Forward Error Correction in Optical Transmission Experiments
TL;DR: In this paper, the authors compared different metrics to predict the error rate of optical systems based on nonbinary forward error correction (FEC) and showed that the mutual information is the best metric to predict performance of coded modulation.
Proceedings ArticleDOI
Long-Haul WDM Transmission with Over-1-Tb/s Channels using Electrically Synthesized High-Symbol-Rate Signals
Takayuki Kobayashi,Masanori Nakamura,Fukutaro Hamaoka,Munehiko Nagatani,Hiroshi Yamazaki,Hideyuki Nosaka,Yutaka Miyamoto +6 more
TL;DR: Key technologies and issues for beyond-l-Tb/s/λ WDM transmission systems with an over-100-Gbaud symbol rate for achieving long-haul transport are discussed.
Journal ArticleDOI
Hybrid constellation entropy loading for adaptively partitioned SSB-DMT systems.
TL;DR: By adaptively partitioning and precoding the subcarriers, a practical and effective entropy loading scheme for single sideband discrete multi-tone (SSB-DMT) systems is proposed and two adaptively partitions methods are proposed to perform hybrid constellation entropy loading (HCEL), a competitive and practical solution for EL in the short-to-medium reach transmission systems.
Patent
Virtual lookup table for probabilistic constellation shaping
TL;DR: Probabilistic generation and decoding of modulation symbols for use with optical communication has been studied in this article, where each type of modulation symbol is sequentially generated using a hardware efficient combination generator that performs as a virtual lookup table (LUT).
Proceedings ArticleDOI
Hybrid Probabilistic-Geometric-Shaped 8-PAM Suitable for Data Centers’ Communication
TL;DR: It is demonstrated that LPDC-coded HPGS 8-PAM outperforms both probabilistic-shaped and uniform LDPC-coded 8- PAM schemes.
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.