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Multi-gigabit/s underwater optical communication link using orbital angular momentum multiplexing.

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    This study demonstrates underwater wireless optical communications (UWOC) using Orbital Angular Momentum (OAM) for spatial multiplexing. A 3 Gbit/s data rate was achieved over 2.96 meters, meeting forward error correction thresholds.

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    Area of Science:

    • Optical Communications
    • Wireless Technology
    • Photonics

    Background:

    • Underwater wireless optical communication (UWOC) is crucial for high-bandwidth data transmission in aquatic environments.
    • Traditional methods face limitations in data rate and reliability due to water's optical properties.

    Purpose of the Study:

    • To experimentally demonstrate a UWOC link utilizing Orbital Angular Momentum (OAM) for spatial multiplexing.
    • To achieve high data rates and low bit error rates in underwater environments.

    Main Methods:

    • Employed two 445-nm fiber-pigtailed laser diodes.
    • Utilized Orbital Angular Momentum (OAM) for spatial multiplexing.
    • Implemented an on-off keying, non-return-to-zero (OOK-NRZ) modulation scheme.

    Main Results:

    • Achieved a data rate of 3 Gbit/s over a 2.96 m distance in water.
    • Measured an attenuation coefficient of 0.4128 m-1.
    • Obtained an average bit error rate (BER) of 2.073 × 10-4, below the forward error correction (FEC) threshold.

    Conclusions:

    • Demonstrated the feasibility of OAM-based spatial multiplexing for high-speed UWOC.
    • Confirmed the system's performance meets forward error correction standards for reliable underwater data transmission.