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Updated: Aug 25, 2025

Quasi-light Storage for Optical Data Packets
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Entropy loading for capacity maximization of RGB-based visible light communications.

Pedro A Loureiro, Vinicius N H Silva, Maria C R Medeiros

    Optics Express
    |October 19, 2022
    PubMed
    Summary
    This summary is machine-generated.

    We introduce probabilistic constellation shaping for visible light communication (VLC) systems. This technique achieves a record 31.2 Gbit/s aggregate bit rate, enhancing data transmission over wide areas.

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    Area of Science:

    • Optical Communications
    • Information Theory
    • Wireless Networks

    Background:

    • Visible Light Communication (VLC) systems offer high bandwidth potential.
    • Optimizing data rates in VLC requires advanced signal processing techniques.
    • Existing VLC systems face limitations in aggregate bit rate and coverage.

    Purpose of the Study:

    • To propose and demonstrate an entropy loading technique for VLC.
    • To maximize the aggregated achievable bit rate of multi-carrier signals.
    • To investigate the impact of subcarrier count and bandwidth on system performance.

    Main Methods:

    • Utilized probabilistic constellation shaping for entropy loading.
    • Employed multiplexed red, green, and blue laser diodes with 1 GHz bandwidth.
    • Analyzed performance with a 20-degree optical diffuser for wide-area coverage.

    Main Results:

    • Achieved a record aggregate bit rate of 31.2 Gbit/s for single-polarization RGB-VLC.
    • Demonstrated effective wide-area coverage at a 0.90 m free-space distance.
    • Identified optimal parameters for subcarriers and signal bandwidth.

    Conclusions:

    • Entropy loading via probabilistic constellation shaping significantly boosts VLC data rates.
    • The proposed system achieves high performance for both data rate and coverage.
    • This technique advances the capabilities of visible light communication systems.