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Photon-counting schemes for MIMO underwater wireless optical communication with arrayed PMTs.

Jinjia Li, Demao Ye, Kang Fu

    Applied Optics
    |February 24, 2022
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    This study explores a photomultiplier tube (PMT)-based multiple-input multiple-output (MIMO) underwater wireless optical communication (UWOC) system. The research demonstrates its potential for high-capacity, long-distance data transmission in aquatic environments.

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    Area of Science:

    • Optics and Photonics
    • Optical Communications
    • Aquatic Technology

    Background:

    • Underwater wireless optical communication (UWOC) is crucial for high-speed data transfer in water.
    • Existing systems face challenges with signal attenuation and low light levels.
    • Photomultiplier tubes (PMTs) offer sensitive detection for low-light conditions.

    Purpose of the Study:

    • To investigate a novel PMT-based multiple-input multiple-output (MIMO) UWOC system.
    • To evaluate the system's performance using photon counting techniques.
    • To analyze the bit error rate and optical link characteristics for various water types.

    Main Methods:

    • Utilized a PMT in photon-counting mode for signal detection.
    • Developed an optical link model and simulated photocount distribution using MATLAB.
    • Evaluated energy per bit (EPB) with on-off keying (OOK) for a 10m link distance.
    • Assessed system performance across different water turbidity levels.

    Main Results:

    • The PMT-based MIMO UWOC system demonstrated effective low-light detection.
    • Photocount distribution simulations accurately predicted received optical power.
    • Performance analysis showed feasibility for different water types at 10m distance.
    • The system achieved a low bit error rate, indicating reliable data transmission.

    Conclusions:

    • The integration of PMTs and MIMO schemes enhances UWOC system capabilities.
    • This approach shows significant potential for robust, long-distance underwater communication.
    • Further research can optimize the system for diverse aquatic conditions and extended ranges.