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    A novel carrier frequency locking method addresses drift in intersatellite laser communication, reducing bit error rates (BER). This technique ensures stable communication by precisely tracking laser frequencies, crucial for reliable data transmission.

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    Area of Science:

    • Optical Communications
    • Satellite Technology
    • Signal Processing

    Background:

    • Carrier frequency drift in intersatellite coherent laser communication, caused by Doppler shifts and laser instability, increases bit error rates (BER).
    • This drift can lead to constellation rotation and degraded communication performance.
    • Existing methods struggle to compensate for significant frequency variations.

    Purpose of the Study:

    • To design and validate a carrier arbitrary frequency difference locking method for intersatellite coherent laser communication.
    • To overcome the limitations of carrier frequency drift in maintaining stable communication links.
    • To improve the reliability and reduce the BER in laser communication systems.

    Main Methods:

    • Utilized principles of laser internal modulation and in-phase and quadrature (IQ) orthogonal modulation.
    • Developed a method for arbitrary frequency difference locking applicable to Binary Phase-Shift Keying (BPSK) and Quadrature Phase-Shift Keying (QPSK) signals.
    • Quantified frequency locking error under varying conditions, including the absence and presence of Doppler frequency shift.

    Main Results:

    • The method successfully locked carrier frequency differences within ±240 MHz for BPSK and ±120 MHz for QPSK.
    • Standard deviations of frequency locking error were 26.1 kHz (BPSK) and 29.2 kHz (QPSK) without Doppler shift.
    • With a ±5.2 MHz/s Doppler shift on a QPSK signal, the standard deviation of frequency locking error was 149.4 kHz.

    Conclusions:

    • The proposed method effectively tracks local oscillator carrier frequency to the light signal carrier frequency.
    • Enables subsequent demodulation algorithms to utilize more bandwidth for mitigating laser phase noise.
    • Ensures a low bit error rate (BER) for robust intersatellite coherent laser communication.