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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Distributed vibration measurement based on a coherent multi-slope-assisted BOTDA with a large dynamic range.

Hua Zheng, Danqi Feng, Jingdong Zhang

    Optics Letters
    |March 2, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method to improve the dynamic range of Brillouin optical time domain analysis. The technique allows for simultaneous demodulation of Brillouin gain and phase shift, enabling precise strain measurement.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Signal processing

    Background:

    • Brillouin optical time domain analysis (BOTDA) is a key technology for distributed strain sensing.
    • Enhancing the dynamic range of BOTDA systems is crucial for measuring larger strain variations.
    • Current BOTDA techniques face limitations in dynamic range and simultaneous measurement of gain and phase.

    Purpose of the Study:

    • To propose and experimentally validate a novel technique for enhancing the dynamic range of coherent slope-assisted BOTDA.
    • To enable simultaneous demodulation of Brillouin gain and phase shift for improved strain determination.
    • To achieve high-resolution and accurate strain measurements over extended fiber lengths.

    Main Methods:

    • A multi-tone probe and a reference wave are launched into the fiber under test (FUT).
    • Simultaneous demodulation of Brillouin gain and Brillouin phase shift for each tone is performed.
    • Strain information is extracted using the Brillouin phase-gain ratio of each tone.
    • A three-tone probe with a 60 MHz interval was employed in the experimental setup.

    Main Results:

    • The technique effectively enhances the dynamic range of the coherent slope-assisted BOTDA system.
    • An effective measurement frequency span exceeding 180 MHz was verified in a ~2 km single-mode fiber.
    • High spatial resolution of 2.5 m and a sampling rate of 1.5 kHz were achieved.
    • A vibration signal with 41 Hz frequency and 2546 με amplitude was successfully demodulated.

    Conclusions:

    • The proposed multi-tone probe technique significantly improves the dynamic range of BOTDA.
    • Simultaneous demodulation of gain and phase offers a robust method for strain measurement.
    • This advancement holds promise for various applications requiring precise distributed strain sensing.