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Coverage extended MMF-based indoor OWC using overfilled launch and diversity reception.

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    Multimode fibers (MMFs) enable beam-steering in optical wireless communications (OWCs) by modifying speckle patterns. Using overfilled launch and multi-receivers significantly improves received optical power stability for enhanced user mobility.

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    Area of Science:

    • Optical Communications
    • Wireless Technologies
    • Photonics

    Background:

    • Speckle patterns from coherent beams interacting with scattering elements are utilized.
    • Multimode fibers (MMFs) offer a low-cost method for beam-steering in optical wireless communications (OWCs) by altering speckle patterns via macro perturbations.
    • Received optical power (ROP) variance in OWC systems limits user terminal mobility.

    Purpose of the Study:

    • To alleviate ROP variance in MMF-based OWC systems.
    • To enhance the stability and steering range of divergent optical beams in OWC.
    • To investigate the effectiveness of overfilled launch and multi-receiver diversity gain.

    Main Methods:

    • Employing overfilled launch into MMFs by adjusting the coupling distance with a single-mode fiber (SMF).
    • Utilizing multi-receiver diversity gain to improve signal-to-noise ratio (SNR).
    • Theoretical analysis of SNR enhancement considering dominant thermal or shot noise.

    Main Results:

    • Increased number of excited modes in MMFs at 1550 nm with minimal losses.
    • Demonstrated compensation for ROP inhomogeneity.
    • Extended full steering angle up to 12° at 1.5 m with BER < 3.8 × 10⁻³.

    Conclusions:

    • The proposed scheme effectively mitigates ROP fluctuations in MMF-based OWC systems.
    • Overfilled launch and multi-receiver diversity enhance system performance and user mobility.
    • The technique provides a practical solution for stable indoor OWC with beam-steering capabilities.