Performance enhanced probabilistically shaped PAM4 signal based on nonlinear differential coding for IM/DD system

Tianyi Liu,Jie Ma, Jia Lu,Jianfei Liu,Xiangye Zeng,Yang Wang

Optical Fiber Technology（2022）

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摘要

•PS-PAM4 signal based on nonlinear differential coding is proposed in IM-DD system.•The improved K-means algorithm gets 8.8dBm power gain for nonlinear channels.•This scheme saves 5.8 GHz band and improves 19Gbps rate compared with ordinary PAM4.•This scheme saves 2.2 GHz band and improves 5Gbps rate compared with CCDM scheme.

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关键词

Intensity modulation and direct detection,Probabilistic shaping,Nonlinear differential coding,Neural network,K-means clustering algorithm

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