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Implementation of a Reference Interferometer for Nanodetection
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Pico-strain resolution fiber-optic sensor with white-light interferometry.

Shuting Liu, Qingwen Liu, Shuangxiang Zhao

    Optics Letters
    |April 29, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel white-light-driven self-reference sensing system using fiber Bragg grating (FBG) sensors and a Mach-Zehnder interferometer (MZI). The system achieves unprecedented high-resolution vibration sensing, significantly outperforming existing FBG technologies.

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    Area of Science:

    • Optical Sensing
    • Photonics
    • Interferometry

    Background:

    • Fiber Bragg grating (FBG) sensors offer simple fabrication and absolute measurement capabilities.
    • Current FBG sensor demodulation using broadband light sources typically achieves resolution at the microstrain (µɛ) level.

    Purpose of the Study:

    • To develop a white-light-driven self-reference sensing system with FBGs for high-resolution vibration sensing.
    • To demonstrate a simple system configuration with multiplexing capabilities.

    Main Methods:

    • Utilized a Mach-Zehnder interferometer (MZI) combined with a white light source and FBG sensors.
    • Implemented a self-reference configuration for enhanced measurement precision.

    Main Results:

    • Achieved a strain resolution of 35 pico strain per root Hertz (pɛ/√Hz) at 1 kHz.
    • Demonstrated multiplexed high-resolution vibration sensing with a simple system configuration.
    • Evaluated system performance and experimentally confirmed multiplexing capability without observable crosstalk.

    Conclusions:

    • The proposed white-light-driven self-reference FBG sensing system significantly improves strain resolution compared to existing white light source systems.
    • The system exhibits excellent multiplexing capability and a simple configuration, making it suitable for advanced vibration sensing applications.