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Modified dual Mach-Zehnder interferometers with new locating algorithm for intrusion detection.

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    Summary
    This summary is machine-generated.

    This study introduces a novel dual Mach-Zehnder interferometer (DMZI) for fiber-optic intrusion detection, eliminating polarization fading. The system achieves precise intrusion location with minimal error, demonstrating long-term stability and high performance.

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    Area of Science:

    • Optical Engineering
    • Fiber Optic Sensing
    • Interferometry

    Background:

    • Fiber-optic intrusion detection systems often suffer from polarization-induced fading.
    • Existing dual Mach-Zehnder interferometer (DMZI) systems typically require polarization control loops.

    Purpose of the Study:

    • To present a new DMZI scheme that eliminates polarization-induced fading.
    • To develop a novel algorithm for locating intrusion-induced disturbances.
    • To demonstrate a robust and stable fiber-optic intrusion detection system.

    Main Methods:

    • Development of a novel dual Mach-Zehnder interferometer (DMZI) optical scheme.
    • Implementation of a new algorithm for intrusion point localization.
    • Experimental validation on a 250-meter fiber optic cable.

    Main Results:

    • The new DMZI scheme successfully eliminates polarization-induced fading without a polarization control loop.
    • Intrusion location errors of less than 26 meters were achieved.
    • The system demonstrated long-term operational stability with consistent performance over years.

    Conclusions:

    • The proposed DMZI system offers a robust solution for fiber-optic intrusion detection.
    • The system provides accurate and reliable intrusion localization.
    • The design ensures high interference visibility and stable locating capabilities over extended periods.