Optimal Shaping Gains for Continuous Spectrum Nonlinear Frequency Signalling over Long Fibers

An approximated channel model is proposed for signalling on the continuous spectrum of a nonlinear frequency division multiplexing communication system, describing the effect of noise and nonlinearity at the receiver. The optimal input distribution that maximizes the mutual information of the propos...

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Bibliographic Details
Main Authors: Chen, Yu, Baniasadi, Mohammadamin, Safari, Majid
Format: Conference Proceeding
Language:English
Subjects:
Continuous Spectrum
Frequency division multiplexing
Frequency modulation
Geometric Shaping
Nonlinear Frequency Division Multiplexing
Optical fiber communication
Optical fiber theory
Phase shift keying
Probabilistic logic
Probabilistic Shaping
Receivers
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Summary:An approximated channel model is proposed for signalling on the continuous spectrum of a nonlinear frequency division multiplexing communication system, describing the effect of noise and nonlinearity at the receiver. The optimal input distribution that maximizes the mutual information of the proposed approximated channel under peak amplitude constraint is then studied. We show that, considering the input-dependency of noise, the conventional amplitude-constrained constellation designs can be shaped geometrically to show significant mutual information gains. However, it is observed that further probabilistic shaping and input distribution size optimization can only provide limited additional gains beyond the best geometrically shaped benchmark scheme, i.e., 64 Amplitude Phase Shift Keying.
ISSN:2157-8117
DOI:10.1109/ISIT50566.2022.9834519