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Multi-kilometer visible light communication utilizing nonlinearity-adaptive hybrid probabilistic-geometric shaping.

Fang Dong, Zhiteng Luo, Zengyi Xu

    Optics Express
    |November 22, 2024
    PubMed
    Summary

    This study introduces nonlinearity-adaptive hybrid probabilistic-geometric constellation shaping (NA-HCS) for visible light communication (VLC). The novel NA-HCS method significantly enhances data rates over long-distance free space optical links.

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    Area of Science:

    • Optoelectronics and Optical Communications
    • Digital Communications
    • Signal Processing

    Background:

    • Visible Light Communication (VLC) systems face challenges in achieving high rate-distance products due to nonlinear impairments in long-haul free space optical (FSO) links.
    • Existing constellation shaping techniques like probabilistic shaping (PS) require adaptation to channel conditions for optimal performance.

    Purpose of the Study:

    • To propose and experimentally validate a novel nonlinearity-adaptive hybrid probabilistic-geometric constellation shaping (NA-HCS) technique for multi-kilometer VLC systems.
    • To optimize constellation shaping for enhanced channel capacity and data rates in nonlinear FSO channels.
    • To demonstrate the superior performance of NA-HCS compared to conventional methods in long-distance VLC.

    Main Methods:

    • Development of a pairwise optimization algorithm for probabilistic shaping (PS) to achieve NA-HCS based on pre-estimated signal-to-noise ratio (SNR) of the nonlinear channel.
    • Implementation of a modified physical free space optical communication equivalent link for experimental validation.
    • Flexible control of Net Data Rate (NDR) using NA-HCS Quadrature Amplitude Modulation (QAM) to manage nonlinear impairments.

    Main Results:

    • The NA-HCS technique demonstrated superior performance over probabilistic shaping-Advanced Phase Shift Keying (PS-APSK) and probabilistic shaping-Quadrature Amplitude Modulation (PS-QAM) within a 1 km transmission channel.
    • A maximum rate-distance product of 61.12 Gbit/s·km was achieved with a Net Data Rate (NDR) of 7.64 Gbit/s over an 8 km distance using NA-HCS-64QAM with a 530 nm laser diode.
    • The system effectively accommodated varying nonlinear impairments, showcasing the adaptability of NA-HCS.

    Conclusions:

    • The proposed NA-HCS technique is highly effective in optimizing channel capacity and achieving high rate-distance products in long-distance VLC systems.
    • NA-HCS offers a flexible and robust solution for mitigating nonlinear impairments in free space optical communications.
    • This technology holds significant promise for future long-haul free space optical communication networks.