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Inter-satellite laser communication system based on double Risley prisms beam steering.

Shaowen Lu, Min Gao, Yan Yang

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    |November 2, 2019
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    Summary

    This study presents a new free-space laser communication terminal. The system achieves high sensitivity and bit error rates, suitable for long-distance inter-satellite communication.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Laser Technology

    Background:

    • Free-space laser communication is crucial for high-bandwidth data transfer.
    • Existing systems face challenges with pointing accuracy and signal stability.
    • The need for robust, long-distance laser communication links is increasing.

    Purpose of the Study:

    • To design and experimentally validate a novel intensity modulation direct detection free-space laser communication terminal.
    • To achieve high sensitivity and low bit-error rates for reliable data transmission.
    • To demonstrate effective suppression of platform jitter for stable communication.

    Main Methods:

    • Utilized a 2W semiconductor laser with a 15 dB modulation contrast, amplified by a two-stage fiber amplifier.
    • Employed a quadrant avalanche photodiode (APD) for beam tracking and signal demodulation.
    • Incorporated rotating double Risley prisms for wide-angle beam steering (±35° pitch, ±180° azimuth).

    Main Results:

    • Achieved a sensitivity of -44.5 dBm and a bit-error rate below 10⁻³ at 70 Mbps without error correction coding.
    • Demonstrated effective suppression of platform jitter below 5 Hz in laboratory experiments.
    • The system exhibits a compact structure, low power consumption, and effective jitter suppression.

    Conclusions:

    • The developed laser communication terminal is suitable for inter-satellite communication over thousands of kilometers.
    • The system's performance validates its potential for robust and reliable space-based optical links.
    • The design offers a practical solution for overcoming challenges in free-space laser communication.