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Hybrid fiber-based time synchronization and vibration detection system.

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    We developed a hybrid fiber system for precise time synchronization and vibration detection. This novel approach leverages existing light signals, enhancing optical network security without extra channels.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Sensing Technology

    Background:

    • Accurate time synchronization is crucial for modern communication networks.
    • Existing fiber optic systems offer potential for integrated sensing capabilities.
    • Vibration detection can enhance the security and integrity of fiber links.

    Purpose of the Study:

    • To propose and demonstrate a hybrid fiber-based system for simultaneous time synchronization and vibration detection.
    • To assess the impact of integrated sensing on time synchronization performance.
    • To explore the potential for enhancing optical network security through vibration monitoring.

    Main Methods:

    • Utilizing Rayleigh backscattering of timing pulses within the fiber link for vibration sensing.
    • Implementing a hybrid system architecture that combines time synchronization and vibration detection functionalities.
    • Conducting multi-user experimental demonstrations on a 40-km fiber link.

    Main Results:

    • Achieved time deviation of 3.6 ps at 1 s and 1.4 ps at 10^4 s, demonstrating high-performance time synchronization.
    • Successfully detected and located vibrations on the fiber link without compromising synchronization accuracy.
    • Validated the multi-functional capability of the optical fiber network.

    Conclusions:

    • The proposed hybrid system effectively integrates time synchronization and vibration detection without performance degradation.
    • This approach offers a cost-effective solution by utilizing existing optical channels for sensing.
    • The system provides a viable method for improving the security of time synchronization networks via vibration analysis.