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Frequency splicing code-based Brillouin optical time domain collider for fast dynamic measurement.

Yin Zhou, Lianshan Yan, Haijun He

    Optics Express
    |May 14, 2021
    PubMed
    Summary

    A new frequency splicing code-based Brillouin optical time domain collider (FSC-BOTDC) enables faster dynamic sensing. This robust system achieves a 10x enhanced sampling rate for precise measurements over long distances.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Signal processing

    Background:

    • Brillouin optical time domain analysis (BOTDA) systems face limitations in dynamic sensing speed and complexity.
    • Previous Brillouin optical time domain collider (BOTDC) systems require intricate designs for multi-point sensing.

    Purpose of the Study:

    • To introduce a novel frequency splicing code-based Brillouin optical time domain collider (FSC-BOTDC) for enhanced fast dynamic sensing.
    • To demonstrate a simpler and more robust BOTDC system capable of high sampling rates.
    • To enable controllable probing of multiple target areas with tunable characteristics.

    Main Methods:

    • Development of a frequency splicing code (FSC) to manage multiple collision modes.
    • Implementation of the FSC-BOTDC system for experimental validation.
    • Utilizing the FSC-BOTDC for single and multiple target area measurements, including periodic mechanical vibrations.

    Main Results:

    • The FSC-BOTDC achieved a 10-time enhanced sampling rate compared to conventional methods.
    • Tailorable sensing measurements were demonstrated through the tunable nature of the FSC.
    • Successful measurement of periodic mechanical vibrations over a 7.9-km range at a 625 Hz sampling rate.

    Conclusions:

    • The proposed FSC-BOTDC offers a significant advancement in fast dynamic sensing capabilities.
    • The system's simplicity and robustness make it a practical solution for various sensing applications.
    • Tunable FSC provides flexibility for diverse measurement requirements in optical fiber sensing.