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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Michelson interferometer-based coherent demodulation for joint time and frequency transfer.

Qingwei Liu, Hao Gao, Jiameng Dong

    Optics Letters
    |April 1, 2025
    PubMed
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    This summary is machine-generated.

    This study demonstrates a novel method for precise joint time and radio frequency (RF) transfer using coherent demodulation over fiber optics. The technique achieves high stability for both time signals and RF frequencies, enhancing synchronization networks.

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    Area of Science:

    • Optical communications
    • Metrology
    • Signal processing

    Background:

    • Accurate time and frequency transfer are crucial for modern communication systems.
    • Existing methods often face limitations in precision and integration.
    • Fiber optic links offer high bandwidth but require robust synchronization techniques.

    Purpose of the Study:

    • To demonstrate a high-precision joint time and radio frequency (RF) transfer scheme.
    • To improve the integration of time and frequency synchronization networks.
    • To leverage coherent demodulation and optical fiber infrastructure.

    Main Methods:

    • Coherent demodulation of a one-pulse-per-second (1 PPS) time signal and an RF signal transmitted over a fiber link.
    • Utilizing a Michelson interferometer (MI) with balanced detection for enhanced signal-to-noise ratio (SNR).
    • Employing microwave phase discrimination techniques to achieve a precise interferometer differential delay for simultaneous signal demodulation.

    Main Results:

    • Achieved time stability (TDEV) of 31.1 ps at 1 s and 3.9 ps at 10,000 s for the 1 PPS signal.
    • Demonstrated frequency stability (ADEV) of 3.9 × 10-14 at 1 s and 6.2 × 10-17 at 10,000 s for a 2.4 GHz RF signal.
    • Successfully performed joint time and frequency transfer over a 560 km fiber link.

    Conclusions:

    • The proposed coherent demodulation technique enables high-precision, simultaneous transfer of time and RF signals.
    • This method offers a viable solution for enhancing the performance of existing optical fiber synchronization networks.
    • The results indicate a significant advancement in integrated time and frequency transfer technologies.