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Controlled alignment imaging optical MIMO communication system based on light spot detection of arrayed light

Yanlong Li, Shuaixing Li, Pengcheng Jiang

    Optics Express
    |November 22, 2024
    PubMed
    Summary

    This study introduces an imaging optical MIMO system for 6G visible light communication (VLC), enhancing data rates and reducing interference. The system maintains stable link alignment and achieves a 20 Mbps total rate with a low bit error rate (BER).

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    Area of Science:

    • Optical communication systems
    • Wireless communication technologies
    • 6G networking

    Background:

    • Visible light communication (VLC) is a key technology for 6G, offering license-free spectrum and high security.
    • Optical Multiple-Input Multiple-Output (MIMO) systems can enhance data rates and reduce inter-channel interference.
    • Link alignment stability is a critical challenge in optical communication systems, especially over varying distances.

    Purpose of the Study:

    • To propose an imaging optical MIMO communication system for 6G applications.
    • To develop an optical alignment strategy to overcome link alignment issues in VLC systems.
    • To improve data transmission rates and reduce interference in optical communication links.

    Main Methods:

    • An imaging optical MIMO communication system was established using a controlled light source array (CLSA).
    • An optical alignment strategy based on light spot detection by the CLSA module was implemented.
    • Rate multiplexing across four channels was utilized to increase the overall data transmission rate.

    Main Results:

    • The system achieved a stable link alignment for communication distances ranging from 20-80 m.
    • A bit error rate (BER) below 10-6 was maintained within the 20-80 m range.
    • A total communication rate of 20 Mbps was achieved through four-channel multiplexing, with single-channel rates at 5 Mbps.
    • Even at extended distances of 80-100 m, the BER remained below the forward error correction (FEC) threshold.

    Conclusions:

    • The proposed imaging optical MIMO system effectively addresses alignment challenges in VLC.
    • The system demonstrates high performance in terms of data rate and link stability for 6G applications.
    • The developed optical alignment strategy ensures reliable communication over changing distances, crucial for practical VLC deployment.