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Fiber-based radio frequency phase synchronization scheme without a time benchmark.

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    This study introduces a novel fiber-optic radio frequency (RF) phase synchronization method using frequency division multiplexing. It achieves high-precision synchronization without a time reference, suitable for distributed systems.

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    Area of Science:

    • Optoelectronics
    • Signal Processing
    • Telecommunications

    Background:

    • Accurate phase synchronization is critical for distributed systems like radar and telescope arrays.
    • Existing methods often require a dedicated time reference, limiting scalability and increasing complexity.

    Purpose of the Study:

    • To develop a novel fiber-optic radio frequency (RF) phase synchronization scheme.
    • To eliminate the need for an external time reference in RF synchronization.
    • To enable high-precision synchronization for distributed applications.

    Main Methods:

    • Generating two homologous RF signals with an integer frequency multiple.
    • Modulating signals onto a single laser carrier via intensity modulation.
    • Utilizing a phase detector and optical delay line for phase locking and compensation.

    Main Results:

    • Demonstrated phase synchronization over 50 km fiber spools.
    • Achieved synchronization accuracy of less than 2 picoseconds (ps).
    • Successfully synchronized higher frequency signals based on the harmonic relationship with a lower frequency signal.

    Conclusions:

    • The proposed frequency division multiplexing scheme provides a simple and scalable solution for RF phase synchronization.
    • This method is highly suitable for distributed applications demanding precise time and frequency synchronization.
    • Potential applications include distributed phase array radar and radio telescope arrays.