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Pre-distortion adaptive optics for optical feeder links: simulations and performance analyses.

Ilija R Hristovski, James Osborn, Ollie J D Farley

    Optics Express
    |June 11, 2024
    PubMed
    Summary

    Adaptive optics (AO) significantly improve free-space optical communication (FSOC) links by reducing uplink losses and atmospheric turbulence. This technology enhances link stability and eases budget requirements for reliable satellite communication.

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    Area of Science:

    • Optical communication systems
    • Satellite communication technology
    • Atmospheric optics

    Background:

    • Free-space optical communication (FSOC) is crucial for future high-bandwidth demands.
    • Atmospheric turbulence severely degrades FSOC link performance, limiting reliability.
    • Geostationary orbit (GEO) feeder links face significant atmospheric challenges.

    Purpose of the Study:

    • To analyze the performance of a bidirectional FSOC link with pre-distortion adaptive optics (AO).
    • To evaluate the impact of AO on a link between an optical ground station and a GEO satellite.
    • To quantify the improvements in link losses, scintillation, and budget requirements.

    Main Methods:

    • End-to-end Monte Carlo simulations were employed for realistic performance estimation.
    • The study focused on a bidirectional FSOC link incorporating pre-distortion AO.
    • The simulation scenario involved a link between the German Aerospace Center (DLR) and the Alphasat GEO satellite.

    Main Results:

    • Pre-distortion AO reduced total uplink losses by up to 10 dB.
    • Scintillation at the GEO satellite was reduced by an order of magnitude.
    • Link budget requirements for 99.9% uptime were eased by 20-40 dB.
    • Using AO with a laser guide star provided an additional 8 dB improvement.

    Conclusions:

    • Pre-distortion adaptive optics are highly effective in mitigating atmospheric turbulence for FSOC links.
    • The application of AO significantly enhances the feasibility and reliability of optical feeder links.
    • AO technology is essential for achieving robust and high-performance satellite communication systems.