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
Robust weighted K-means clustering algorithm for a probabilistic-shaped 64QAM coherent optical communication system.
Xishuo Wang,Qi Zhang,Xiangjun Xin,Ran Gao,Qinghua Tian,Feng Tian,Chuxuan Wang,Xiaolong Pan,Yongjun Wang,Yang Leijing +9 more
TL;DR: The results show that the proposed algorithm has outperformed K-means with respect to bit error rate, clustering robustness and iteration times in both back-to-back and 375km transmission scenarios.
Journal ArticleDOI
Does Probabilistic Constellation Shaping Benefit IM-DD Systems Without Optical Amplifiers?
Di Che,Junho Cho,Xi Chen +2 more
TL;DR: This paper reveals when the transmitter enhances the peak-to-average power ratio of the signal, a PPC system can be partially or even fully converted to an APC system in which the classical PCS offers its merits.
Journal ArticleDOI
Dual Polarization Full-Field Signal Waveform Reconstruction Using Intensity Only Measurements for Coherent Communications.
TL;DR: This work presents a full-field measurement technique using only direct detection that does not require any beating with a strong carrier LO, and proposes phase retrieval algorithms based on alternating projections that makes use of dispersive elements, allowing to recover the optical phase from intensity-only measurements.
Proceedings ArticleDOI
Experimental analysis of pilot-based equalization for probabilistically shaped WDM systems with 256QAM/1024QAM
TL;DR: Pilot based equalization is studied in a 5×10 GBaud WDM transmission experiment and is demonstrated for 256/1024QAM with uniform and probabilistically optimized distribution using an optimized pilot insertion rate of 2–5%.
Journal ArticleDOI
Polarization-diversity receiver using remotely delivered local oscillator without optical polarization control
TL;DR: A hybrid single-polarization coherent receiver and Stokes vector receiver and SVR for polarization-diversity coherent detection without a need of optical polarization control for the remotely delivered LO is proposed.
References
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Journal ArticleDOI
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Threshold Saturation via Spatial Coupling: Why Convolutional LDPC Ensembles Perform So Well over the BEC
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Journal ArticleDOI
Bandwidth Efficient and Rate-Matched Low-Density Parity-Check Coded Modulation
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