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2D optical wireless broadcasting system enabled by a liquid crystal on silicon and rotated-splitting-SLM algorithm.

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    This study introduces a 2D optical wireless broadcasting system using a liquid crystal on silicon (LCoS) device. The system achieves low path loss for high-speed, multi-user data transmission in dynamic networks.

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    Area of Science:

    • Optical wireless communications
    • Free-space optics
    • Broadcasting systems

    Background:

    • Optical wireless systems offer high bandwidth potential.
    • Minimizing path loss is crucial for effective signal transmission.
    • Liquid Crystal on Silicon (LCoS) devices are adaptable for optical modulation.

    Purpose of the Study:

    • To propose and demonstrate a 2D optical wireless broadcasting system with reduced path loss.
    • To enable high-speed data transmission to multiple users.
    • To validate the system's performance in combined fiber and free-space links.

    Main Methods:

    • Utilized a commercial Liquid Crystal on Silicon (LCoS) device.
    • Implemented a novel rotated-splitting-Spatial Light Modulator (SLM) algorithm.
    • Designed a pair of fiber collimators with large beam waist to minimize coupling loss.
    • Achieved 60-Gb/s Pulse Amplitude Modulation with 4 levels (PAM-4) signal transmission.

    Main Results:

    • Successfully demonstrated a low path loss optical wireless broadcasting system.
    • Achieved signal broadcasting over a 2-km standard single mode fiber and a 14 m free space link.
    • Transmitted data to up to four mobile users with 16 dB path loss.
    • Confirmed the viability of the LCoS-based system for multi-user broadcasting.

    Conclusions:

    • The proposed LCoS-based optical wireless system effectively reduces path loss.
    • The system supports high-speed, multi-user broadcasting in dynamic in-building networks.
    • The rotated-splitting-SLM method is suitable for advanced optical communication applications.