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Array detector systems for satellite-to-ground atmospheric coherent laser communications: performance evaluation.

Yutao Liu, Xueting Dang, Xinghu Fu

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    Summary

    Array detectors significantly improve satellite-to-ground laser communication performance by mitigating atmospheric turbulence. This enhances mixing efficiency (ME) and bit error rate (BER), crucial for reliable optical systems.

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    Area of Science:

    • Optical Engineering
    • Aerospace Communications
    • Atmospheric Physics

    Background:

    • Satellite-to-ground laser communication faces challenges from atmospheric turbulence.
    • Array detection offers a potential solution to mitigate these effects, but experimental validation is costly.
    • Simulating atmospheric turbulence is essential for system design and performance prediction.

    Purpose of the Study:

    • To develop and validate a simulation model for satellite-to-ground optical communication downlink.
    • To evaluate the performance of single and array detector systems under simulated atmospheric turbulence.
    • To quantify the benefits of array detectors for coherent laser communication.

    Main Methods:

    • Utilized equivalent Rytov index-interval phase screens with a non-Kolmogorov power spectrum to model atmospheric turbulence.
    • Simulated a satellite-to-ground optical communication downlink scenario.
    • Assessed system performance using mixing efficiency (ME) and bit error rate (BER) metrics.

    Main Results:

    • Array detectors demonstrably enhance both mixing efficiency and bit error rate performance.
    • Coherent mixing efficiency showed a near-linear increase with the number of array elements.
    • The simulation model effectively predicted performance improvements with array detection.

    Conclusions:

    • Array detectors are a key technology for improving the robustness of satellite-to-ground coherent laser communications.
    • The developed simulation methodologies provide valuable tools for communication link budget forecasting.
    • This research informs optical system design requirements for future space-based optical networks.