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Computational temporal ghost imaging for long-distance underwater wireless optical communication.

Xinwei Chen, Mengyin Jin, Honglan Chen

    Optics Letters
    |April 15, 2021
    PubMed
    Summary

    This study introduces a novel underwater wireless optical communication (UWOC) system using computational temporal ghost imaging (CTGI). The CTGI system achieves error-free, long-distance UWOC with high signal-to-noise ratio using a low-bandwidth detector.

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    Area of Science:

    • Optical Engineering
    • Wireless Communication
    • Signal Processing

    Background:

    • Underwater wireless optical communication (UWOC) faces challenges with signal attenuation and detector bandwidth limitations.
    • Traditional methods struggle to achieve high-frequency transmission over long distances in underwater environments.

    Purpose of the Study:

    • To propose and experimentally validate a novel UWOC system leveraging computational temporal ghost imaging (CTGI).
    • To demonstrate error-free, long-distance UWOC transmission using a low-bandwidth, high-sensitivity avalanche photodiode.
    • To investigate the performance of CTGI in UWOC systems, including its relationship with segmented reconstruction.

    Main Methods:

    • Developed a UWOC system integrating CTGI with a low-bandwidth avalanche photodiode.
    • Measured water attenuation coefficients and used neutral density filters for optical power attenuation to estimate communication distance.
    • Employed segmented reconstruction methods to enhance transmission performance and range.

    Main Results:

    • Achieved error-free transmission at a 4 GHz transmitting frequency and an estimated distance of 144.37 m using CTGI.
    • Demonstrated error-free transmission at 4 GHz and 193.10 m with the segmented reconstruction method.
    • Observed significantly higher peak signal-to-noise ratios compared to on-off keying, confirming CTGI's effectiveness.

    Conclusions:

    • The proposed CTGI-based UWOC system enables high-frequency signal detection by low-bandwidth photodetectors for long-distance applications.
    • CTGI offers a promising technique for overcoming bandwidth limitations in underwater optical communication.
    • Segmented reconstruction further enhances the performance and achievable distance of CTGI-based UWOC systems.