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Prototype system for underwater wireless optical communications employing orbital angular momentum multiplexing.

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    We developed a compact, energy-efficient underwater wireless optical communication (UWOC) system using orbital angular momentum (OAM) multiplexing. This practical prototype supports high-speed data transmission in underwater environments.

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    Area of Science:

    • Optical Communications
    • Wireless Communication Technologies
    • Photonics

    Background:

    • Orbital angular momentum (OAM) multiplexing is crucial for enhancing underwater wireless optical communication (UWOC) capacity.
    • Current UWOC systems often rely on bulky, power-intensive laboratory equipment, limiting real-world applicability.

    Purpose of the Study:

    • To propose, design, and demonstrate a compact and energy-efficient OAM-multiplexing UWOC prototype with complete packaging.
    • To overcome the limitations of existing UWOC systems for practical deployment.

    Main Methods:

    • Integrated programmable chips were employed to enhance signal generation, modulation, receiving, and processing components.
    • Two geometric phase Q-plate chips were utilized as OAM multiplexer and de-multiplexer.
    • The complete UWOC system was packaged into two compact boxes (65cm×35cm×40cm) with low power consumption (20W).

    Main Results:

    • The developed prototype successfully supported two 625 Mbit/s channels (OAM+3, OAM-3) multiplexing.
    • The system demonstrated high-fidelity performance in a 6-meter underwater environment.
    • The complete system achieved a low power consumption of 20W.

    Conclusions:

    • A compact, energy-efficient, and fully packaged OAM-multiplexing UWOC system has been successfully demonstrated.
    • The prototype offers a practical solution for high-capacity underwater optical communication.
    • The integrated design and component improvements pave the way for more robust and deployable UWOC systems.