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Full-duplex high-speed indoor optical wireless communication system based on a micro-LED and VCSEL array.

Zixian Wei, Shi Zhang, Simei Mao

    Optics Express
    |March 27, 2021
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    Summary
    This summary is machine-generated.

    This study presents a high-speed optical wireless communication (OWC) system using micro-LEDs and VCSELs. The system achieves multi-gigabit data rates for both downlink and uplink, enhancing mobile communication potential.

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    Area of Science:

    • Optoelectronics
    • Wireless Communication
    • Optical Engineering

    Background:

    • Optical wireless communication (OWC) offers a high-bandwidth alternative to traditional wireless systems.
    • Micro-size devices are crucial for developing compact and efficient OWC systems.
    • Full-duplex communication is essential for interactive applications.

    Purpose of the Study:

    • To develop and demonstrate a full-duplex, high-speed OWC system using micro-LED and VCSEL arrays.
    • To achieve multi-gigabit data rates for both downlink and uplink communication.
    • To investigate the performance of lens-free receivers for uplink transmission.

    Main Methods:

    • Implementation of a quantum dot (QD) micro-LED for the high-capacity downlink.
    • Utilizing VCSEL arrays for both line-of-sight (LOS) and non-line-of-sight (NLOS) uplinks.
    • Employing adaptive orthogonal frequency division multiplexing (OFDM) for downlink and non-return-to-zero on-off keying (NRZ-OOK) for uplink.

    Main Results:

    • Downlink achieved 2.74 Gbps using QD micro-LED with adaptive OFDM.
    • VCSEL-based uplinks (LOS and NLOS) reached 2.125 Gbps with NRZ-OOK and BER below the FEC threshold.
    • Lens-free uplink receivers demonstrated effective communication over 2.2 m, simplifying alignment and improving mobility.

    Conclusions:

    • The developed OWC system provides sufficient bandwidth for multi-gigabit communication.
    • Lens-free uplink receivers enhance the practicality and mobility of OWC systems.
    • The system operates with low driving currents, ensuring human eye safety.