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Systematic Frequency Error in Laser Synchronization Circuits for Fiber-Optic Time-Transfer Systems.

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    A systematic frequency error in laser synchronization circuits, crucial for fiber-optic time transfer, can reach tens of megahertz at low reference laser power. This study models and predicts this error for improved time/frequency metrology.

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    Area of Science:

    • Optical physics
    • Metrology
    • Electrical engineering

    Background:

    • Semiconductor laser synchronization circuits are vital for ultra-precise fiber-optic time-transfer links.
    • A systematic frequency error arises in these circuits when reference laser power drops below -40 dBm.
    • This error can reach tens of megahertz and impacts time/frequency metrology.

    Purpose of the Study:

    • To investigate the cause and characteristics of a systematic frequency error in laser synchronization circuits.
    • To develop models for predicting and understanding this error.
    • To assess mitigation strategies like polarization scrambling.

    Main Methods:

    • Analysis of beat note frequency counting in synchronization circuits.
    • Development of theoretical and simulation models for the systematic frequency error.
    • Experimental validation of the theoretical models.
    • Investigation of polarization scrambling as a mitigation technique.

    Main Results:

    • The systematic frequency error is dependent on reference laser power and noise spectrum.
    • Theoretical models accurately predict the error, showing good agreement with experimental data.
    • Polarization scrambling was evaluated for its effectiveness and associated penalty.

    Conclusions:

    • The developed models provide a valuable tool for designing and understanding laser synchronization circuits.
    • Accurate prediction and mitigation of the systematic frequency error are essential for reliable fiber-optic time transfer.
    • The study offers insights into optimizing circuit performance in low-light conditions.