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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Research on optical sparse code division multiple access encoding technology based on a multi-core fiber.

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    Sparse code division multiple access (SCMA) enhances 5G optical networks by enabling high-capacity user access over multi-core fiber. This study demonstrates a 30 Gb/s SCMA system achieving forward error correction limits with reduced receiver complexity.

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    Area of Science:

    • Optical Communications
    • Wireless Technologies
    • Signal Processing

    Background:

    • Sparse code division multiple access (SCMA) is a key 5G technology.
    • Optical access networks face challenges with increasing user demand.
    • SCMA offers potential solutions for high-density optical access.

    Purpose of the Study:

    • To propose and experimentally validate an SCMA transmission system over multi-core fiber.
    • To investigate methods for reducing receiver complexity in SCMA systems.
    • To assess the performance of SCMA in next-generation optical access networks.

    Main Methods:

    • Implementation of a 30 Gb/s SCMA signal transmission system using a seven-core fiber.
    • Experimental verification of bit error rate (BER) performance against the forward error correction (FEC) limit.
    • Development of a novel message passing algorithm (MPA) utilizing fiber core dimension to reduce complexity.

    Main Results:

    • Successful transmission of SCMA signals at 30 Gb/s over a seven-core fiber (four cores utilized).
    • Achieved FEC limit (BER of 3.8 × 10⁻³) at a received optical power of -10 dBm.
    • Proposed MPA scheme reduced superimposed users and incurred only a ~1 dB SNR penalty at the FEC limit compared to the original MPA.

    Conclusions:

    • The proposed SCMA over multi-core fiber system is a feasible solution for next-generation optical access networks.
    • The novel MPA significantly reduces receiver complexity while maintaining high performance.
    • This research paves the way for scalable and efficient optical access solutions.