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Autoencoder assisted subcarrier optimization for nonlinear frequency division multiplexing.

Peiyun Ge, Lixia Xi, Jiayun Deng

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    |October 20, 2023
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    Summary
    This summary is machine-generated.

    This study introduces an auto-encoder optimized subcarrier scheme for nonlinear frequency division multiplexing (NFDM) optical systems. The new method significantly improves signal quality (Q-factor) over traditional designs.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Nonlinear frequency division multiplexing (NFDM) offers nonlinear-free transmission but relies on subcarrier designs, typically sinc functions, that may not be optimal for nonlinear spectrums.
    • Current NFDM designs are analogous to orthogonal frequency division multiplexing (OFDM), potentially limiting performance in nonlinear environments.

    Purpose of the Study:

    • To propose and evaluate an auto-encoder (AE) assisted subcarrier optimization scheme for dual-polarized (DP) NFDM systems.
    • To enhance the performance of NFDM by optimizing subcarrier characteristics for nonlinear transmission.

    Main Methods:

    • An auto-encoder (AE) based approach was developed to optimize subcarrier functions for DP-NFDM systems.
    • Numerical simulations were conducted to verify the performance improvements against established methods like sinc subcarriers and linear minimum mean square error (LMMSE) equalization.

    Main Results:

    • The proposed AE-assisted scheme improved the Q-factor by 1.54 dB compared to sinc subcarriers and 0.62 dB compared to LMMSE equalization over a 960 km transmission.
    • The optimized subcarriers demonstrated robustness across various modulation formats, transmission distances, and bandwidths.
    • Analysis revealed how optimized subcarriers enhance performance in nonlinear optical communication systems.

    Conclusions:

    • The auto-encoder assisted subcarrier optimization provides a novel and effective approach for improving DP-NFDM system performance.
    • This method offers a new direction for subcarrier design in NFDM, enhancing transmission quality and robustness.