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Multipath lens for eye-safe optical wireless communications.

René Kirrbach, Tobias Schneider, Michael Faulwaßer

    Optics Express
    |October 7, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Multipath lenses (MPLs) enhance optical wireless communications (OWC) by increasing transmission power and range. This innovation improves eye safety and enables longer-distance, reliable data transmission for laser diodes.

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    Area of Science:

    • Optics
    • Optical Wireless Communications
    • Photonics

    Background:

    • Optical wireless communications (OWC) utilize light for data transmission.
    • Small-sized emitters like laser diodes (LDs) have limitations in transmission power and range.
    • Eye safety regulations, such as maximum permissible exposure (MPE), restrict transmission power.

    Purpose of the Study:

    • To design and evaluate multipath lenses (MPLs) for enhancing OWC systems.
    • To improve eye safety by increasing the maximum permissible exposure (MPE).
    • To boost the transmission power and operational range of small-sized emitters.

    Main Methods:

    • Design and fabrication of a prototype freeform multipath lens (MPL).
    • Characterization of the MPL's optical performance.
    • Analysis of the lens's effect on laser diode emission patterns and power distribution.

    Main Results:

    • The MPL achieved a 13 dB increase in optical transmission power.
    • This power increase corresponds to a 4.5x improvement in maximum communication range.
    • The MPL transformed elliptical LD emission into a homogenous rectangular field-of-view (FOV) with 0.905 transmission efficiency.

    Conclusions:

    • Freeform multipath lenses are effective in enhancing OWC system performance.
    • MPLs significantly increase transmission power, extend communication range, and improve eye safety.
    • The developed MPL offers a viable solution for high-performance, safe optical wireless communication.