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MEMS tracking mirror system for a bidirectional free-space optical link.

Sungho Jeon, Hiroshi Toshiyoshi

    Applied Optics
    |October 20, 2017
    PubMed
    Summary

    This study presents a bidirectional free-space optical system with automatic link establishment and tracking. It utilizes a micro-electro-mechanical systems (MEMS) scanner for precise laser steering, ensuring reliable data transmission between moving nodes.

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    Area of Science:

    • Optical Engineering
    • Robotics
    • Telecommunications

    Background:

    • Free-space optical communication offers high bandwidth potential but faces challenges in link stability and node mobility.
    • Maintaining a consistent optical link between dynamic nodes requires precise beam steering and rapid re-acquisition mechanisms.

    Purpose of the Study:

    • To develop and demonstrate a bidirectional free-space optical system capable of automatic optical link establishment and continuous tracking.
    • To investigate the use of piezoelectric micro-electro-mechanical systems (MEMS) optical scanners for dynamic beam steering and link maintenance.
    • To achieve rapid optical link transition times for robust communication with moving nodes.

    Main Methods:

    • A bidirectional free-space optical system was designed incorporating a piezoelectric MEMS optical scanner.
    • Two laser wavelengths were superposed for communication zone visualization, remote node searching via retro-reflector optics, and data transmission.
    • A feedback control system was implemented to dynamically manage the MEMS scanner for link establishment and tracking.

    Main Results:

    • The system successfully demonstrated automatic connection and tracking of an optical link between two nodes.
    • The piezoelectric MEMS optical scanner enabled precise beam steering for link establishment and maintenance.
    • Dynamic optical link establishment was achieved within a 10-ms transition time, effectively tracking moving nodes.

    Conclusions:

    • The developed free-space optical system with MEMS scanner technology provides a robust solution for establishing and maintaining optical links between dynamic nodes.
    • The system's rapid transition time and tracking capabilities are crucial for reliable optical wireless communication in mobile scenarios.
    • This technology holds promise for applications requiring high-speed, secure, and mobile free-space optical communication.