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Frequency-comb-based BOTDA sensors for high-spatial-resolution/long-distance sensing.

Xin-Hong Jia, Han-Qing Chang, Kai Lin

    Optics Express
    |April 7, 2017
    PubMed
    Summary
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    Frequency-comb-based Brillouin optical time-domain analysis (BOTDA) sensors achieve reduced acquisition time and improved resolution. A novel method suppresses spectral distortion, enabling high-resolution sensing and extending detection distances up to 74.2 km.

    Area of Science:

    • Fiber optic sensing
    • Optical metrology
    • Nonlinear optics

    Background:

    • Standard frequency-comb-based Brillouin optical time-domain analysis (BOTDA) faces challenges with double-sideband (DSB) pulses causing Brillouin gain spectrum (BGS) distortion.
    • This distortion limits high-spatial-resolution sensing due to increased pulse power requirements.

    Purpose of the Study:

    • To develop frequency-comb-based BOTDA sensors for simultaneous acquisition-time reduction and high-spatial-resolution/long-distance sensing.
    • To overcome BGS distortion issues in standard frequency-comb-based BOTDA systems.

    Main Methods:

    • Utilizing a single sideband of the DSB pulse to suppress BGS distortion.
    • Implementing a phase-shifted pulse for phonon pre-excitation.
    • Employing a frequency comb for the probe wave to mitigate pulse distortion and non-local effects.

    Related Experiment Videos

    Main Results:

    • Demonstrated a sensor with approximately 60 cm spatial resolution over 592 m fiber length.
    • Achieved approximately 6 m spatial resolution over a 74.2 km sensing fiber length.
    • Successfully suppressed BGS distortion and extended sensing capabilities.

    Conclusions:

    • The proposed single-sideband approach effectively suppresses BGS distortion in frequency-comb-based BOTDA.
    • This advancement enables simultaneous high-spatial-resolution and long-distance fiber sensing.
    • Frequency-comb-based BOTDA shows significant potential for extended-range and precise distributed sensing applications.