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Distributed acoustic sensor based on a two-mode fiber.

Mengmeng Chen, Ali Masoudi, Francesca Parmigiani

    Optics Express
    |November 25, 2018
    PubMed
    Summary
    This summary is machine-generated.

    A novel distributed acoustic sensor (DAS) using two-mode optical fiber is demonstrated. This technology quantifies vibrations and improves noise floor by 2.52dB, confirming few-mode fibers for DAS applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Vibration Monitoring

    Background:

    • Distributed acoustic sensing (DAS) typically uses single-mode fibers.
    • Existing DAS systems face limitations in sensitivity and noise performance.
    • Few-mode fibers offer potential for enhanced sensing capabilities.

    Purpose of the Study:

    • To demonstrate a distributed acoustic sensor (DAS) utilizing two-mode optical fiber.
    • To investigate the quantification of vibrations using higher-order modes in few-mode fibers.
    • To assess the performance improvement achievable by combining modal information.

    Main Methods:

    • Implementation of a DAS system based on two-mode optical fiber.
    • Utilizing a phase-sensitive optical time-domain reflectometry (φ-OTDR) interrogation technique.
    • Analyzing backscattered light from higher-order modes for vibration quantification.

    Main Results:

    • Successful demonstration of a two-mode fiber-based DAS.
    • Full quantification of vibrations along the sensing fiber using higher-order modes.
    • Achieved a 2.52dB improvement in noise floor by combining results from different modes.

    Conclusions:

    • Few-mode fibers are suitable for advanced DAS applications.
    • Combining modal information enhances DAS performance.
    • This approach offers a promising solution for improved vibration sensing.