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Exploiting nonreciprocity in BOTDA systems.

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    This study introduces a new method for distributed measurements in Brillouin optical time-domain analysis using stimulated Brillouin scattering. The technique simplifies BPS retrieval without needing phase modulation or high-bandwidth detectors.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Fiber Optic Sensing

    Background:

    • Brillouin optical time-domain analysis (BOTDA) is crucial for distributed fiber sensing.
    • Existing BOTDA methods for retrieving Brillouin phase-shift spectrum (BPS) distribution can be complex, requiring phase modulation, filtering, and high-bandwidth detectors.

    Purpose of the Study:

    • To present a novel and simplified technique for distributed measurements in BOTDA.
    • To retrieve the position-resolved Brillouin phase-shift spectrum (BPS) along an optical fiber.

    Main Methods:

    • Utilizing the nonlinear phase-shift induced by stimulated Brillouin scattering.
    • Employing a Sagnac interferometer (SI) to leverage its sensitivity to nonreciprocal phase-shifts.
    • Theoretical description, numerical simulations, and experimental validation.

    Main Results:

    • Demonstration of a simplified method for BPS distribution retrieval in optical fibers.
    • Successful position-resolved BPS measurement without phase modulation, filtering, or high-bandwidth detectors.
    • Validation of the technique through theoretical, numerical, and experimental approaches.

    Conclusions:

    • The proposed Sagnac interferometer-based technique offers a simplified approach to distributed BOTDA measurements.
    • This method eliminates the need for complex components, making BPS retrieval more accessible.
    • The findings pave the way for more efficient and straightforward fiber optic sensing applications.