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Interoperability in optical frequency transfer fiber optic links.

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    This study demonstrates interoperability in heterogeneous optical frequency transfer fiber links using specialized frequency shifters and automatic recovery systems. The findings show comparable stability and accuracy to homogeneous chains, advancing optical network reliability.

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    Area of Science:

    • Optical Communications
    • Metrology
    • Fiber Optic Networks

    Background:

    • Heterogeneous optical frequency transfer fiber links require equipment interoperability despite diverse designs.
    • Repeater laser stations are critical components needing specific optical signal frequency relationships.
    • Link failures necessitate autonomous recovery mechanisms for uninterrupted operation.

    Purpose of the Study:

    • To investigate and demonstrate the interoperability of heterogeneous optical frequency transfer fiber links.
    • To address challenges in frequency synchronization and autonomous recovery in diverse network configurations.
    • To validate the performance of specialized optical frequency shifters for heterogeneous systems.

    Main Methods:

    • Experimental investigation of two distinct repeater laser station designs.
    • Utilized dedicated optical frequency shifters to manage frequency differences between ports.
    • Tested link recovery capabilities following simulated failures (power loss, fiber break) in a 500 km laboratory setup.

    Main Results:

    • Demonstrated successful interoperability of tested devices in various configurations within a heterogeneous fiber link.
    • Achieved transfer stability and frequency inaccuracy comparable to homogeneous chains (reaching 10⁻²⁰ at 10⁴ s averaging time).
    • Validated the effectiveness of optical frequency shifters and autonomous recovery for heterogeneous link operation.

    Conclusions:

    • Heterogeneous optical frequency transfer fiber links can achieve high performance and reliability through technological solutions.
    • The developed methods ensure seamless operation and robustness against link failures.
    • This research enables the integration of diverse equipment, enhancing the flexibility and scalability of optical frequency transfer networks.