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Brillouin optical time-domain analysis sensor with pump pulse amplification.

Juan José Mompó, Javier Urricelqui, Alayn Loayssa

    Optics Express
    |July 14, 2016
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    This study introduces a novel method to enhance Brillouin optical time-domain analysis (BOTDA) sensors by mitigating pump pulse attenuation. The technique amplifies the pump pulse, improving signal-to-noise ratio and measurement accuracy in long-haul fiber links.

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    Area of Science:

    • Optical sensing
    • Photonics
    • Fiber optics

    Background:

    • Brillouin optical time-domain analysis (BOTDA) is a crucial technique for distributed fiber sensing.
    • Pump pulse attenuation in BOTDA systems limits sensing range and accuracy.
    • Existing methods for mitigating attenuation are often complex or inefficient.

    Purpose of the Study:

    • To develop a simple and effective technique for mitigating pump pulse attenuation in BOTDA sensors.
    • To improve the signal-to-noise ratio (SNR) and measurement accuracy of BOTDA systems.
    • To enhance the robustness of BOTDA sensors against various noise sources and non-local effects.

    Main Methods:

    • Operating the BOTDA sensor in a loss configuration to transfer energy from the probe wave to the pump pulse.
    • Amplifying the pump pulse through counter-propagation with the probe wave.
    • Modulating the optical frequency of the probe wave along the fiber to ensure a flat gain spectrum for the pump pulse, preventing distortion.

    Main Results:

    • Successful experimental demonstration of the technique in a 100-km fiber link.
    • Achieved a measurement uncertainty of 1 MHz at the worst-contrast position.
    • The frequency modulation of the probe wave provided increased tolerance to non-local effects and spontaneous Brillouin scattering noise.

    Conclusions:

    • The proposed technique effectively mitigates pump pulse attenuation in BOTDA sensors.
    • The method enhances SNR and measurement accuracy, enabling safe deployment of higher probe power.
    • This simple yet powerful technique offers a significant advancement for long-range distributed fiber sensing applications.