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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Neural network-based equalizers for nonlinear frequency division multiplexing transmission.

Ruichen Wang, Qingsong Hu, Junhe Zhou

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    Summary
    This summary is machine-generated.

    This study introduces a novel neural network equalizer for nonlinear frequency division multiplexing (NFDM) systems. The new approach effectively retrieves information and reduces complexity in optical fiber networks.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Artificial Intelligence

    Background:

    • Nonlinear frequency division multiplexing (NFDM) is a promising technique to mitigate fiber nonlinearity-induced signal distortion in optical networks.
    • Information retrieval in NFDM systems is challenging due to signal perturbations during propagation.
    • Existing methods struggle with the complexity of receivers in dual-polarization NFDM (DP-NFDM) systems.

    Purpose of the Study:

    • To propose a novel neural network (NN)-based equalizer for NFDM systems.
    • To address the information retrieval challenges in perturbed NFDM signals.
    • To reduce the computational complexity of receivers in DP-NFDM systems.

    Main Methods:

    • A nonlinear frequency domain neural network (NN) equalizer is proposed, leveraging phase relationships between modulated information on different eigenvalues.
    • A time-domain NN with similar parameters is utilized to manage overall receiver complexity.
    • The proposed NN-based equalizers were tested in dual-polarization NFDM (DP-NFDM) transmitting systems.

    Main Results:

    • The proposed NN-based equalizers successfully maintained a low bit error rate (BER).
    • Effective signal retrieval was achieved after transmission distances of up to 2800 km.
    • The approach demonstrated significant performance enhancement and reduced computational complexity.

    Conclusions:

    • The novel NN-based equalizer effectively addresses signal perturbation issues in NFDM systems.
    • The proposed method offers a viable solution for complex receiver designs in DP-NFDM.
    • This research advances the practical application of NFDM in high-capacity optical fiber networks.