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Autoencoder assisted subcarrier optimization for nonlinear frequency division multiplexing
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DOI：10.1364/OE.500473.png)
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Nonlinear frequency division multiplexing (NFDM) is a novel optical communication technique that can achieve nonlinear free transmission. However, current design of NFDM is analogous to orthogonal frequency division multiplexing (OFDM), where sinc function is utilized as subcarriers, which may not be optimal for nonlinear spectrums. In this paper, we propose an auto-encoder (AE) assisted subcarrier optimization scheme for dual-polarized (DP) NFDM systems. Numerical verifications show that our scheme can improve the Q-factor by 1.54 dB and 0.62 dB compared to sinc subcarrier and linear minimum mean square error (LMMSE) equalization, respectively, in a 960 km transmission scenario. We also analyze the characteristics of the optimized subcarriers and discuss how they enhance the performance. Furthermore, we demonstrate the robustness of the optimized subcarriers to different modulation formats, transmission distances and bandwidth. Our work provides a new idea in subcarrier design for NFDM.(c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Keyword:
POLARIZATION NFDM TRANSMISSION
FOURIER-TRANSFORM
OPTICAL COMMUNICATIONS
DISCRETE EIGENVALUE
COMMUNICATION
SPECTRUM
MODULATION
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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