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Urbach-edge-assisted electro-absorption for enhanced free-space optical modulation.

I R Hristovski, N I Lesack, L A Herman

    Optics Letters
    |May 2, 2020
    PubMed
    Summary

    This study presents an electro-absorption (EA)-based retro-modulator for efficient free-space optical communication. The device achieves deep modulation depths, meeting key demands for passive downlink systems.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Materials Science

    Background:

    • Free-space optical (FSO) communication systems require efficient modulation techniques for passive downlinks.
    • Existing retro-modulators face challenges in achieving deep modulation and broad directionality.

    Purpose of the Study:

    • To introduce a novel electro-absorption (EA)-based retro-modulator for effective free-space optical communications.
    • To address the demands for deep modulation and broad directionality in passive downlink FSO links.

    Main Methods:

    • Development of a corner-cube assembly of EA-modulators utilizing semi-insulating InP.
    • Exploitation of Urbach-edge-assisted electro-absorption, optimizing field-induced absorption via temperature.
    • Theoretical modeling combining the Einstein model and Franz-Keldysh effect.

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    Main Results:

    • Experimental validation using a prototype demonstrated good agreement with theoretical predictions.
    • Achieved deep modulation depths exceeding 15% through Urbach-edge-assisted EA.
    • Optimized field-induced absorption by leveraging the temperature-dependent Urbach tail near 980 nm.

    Conclusions:

    • The developed EA-based retro-modulator effectively meets the requirements for deep modulation and broad directionality in FSO systems.
    • This technology shows significant potential for advancing passive downlink free-space optical communication links.