DNN-assisted phase distance tuned PSK modulation for PAM4-to-QPSK format conversion gateway node
OPTICS EXPRESS(2022)
摘要
This paper proposes an optical gateway that converts pulse amplitude modulation (PAM) format to phase shift keying (PSK) modulation format, enabling flexible intensity-to-phase mapping without relying on optical-electrical-optical data conversion at heterogenous network connections. A proof-of-principle experiment shows that optically converted PSK signals from regular PAM signals will induce non-uniform irregular phase noise distortion. The proposed optical gateway is designed to provide an optimized phase distance for PSK signals such that an achievable information rate is maximized by a deep learning-based decision on the receiver side. The phase distance-tuned PSK signals offer performance improvement of about 4 dB gain at a target generalized mutual information by making use of a digital neural network recovery. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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关键词
psk modulation,optical geometric constellation,dnn-assisted,to-qpsk
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