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    We developed a compact optical fiber vibration sensor using multicore optical fiber (MCF). This versatile device, operating in reflection mode, offers tunable sensitivity for vibration detection across various frequencies.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Vibration Measurement Technologies

    Background:

    • Interferometric sensors offer high sensitivity for measuring physical parameters.
    • Multicore optical fibers (MCFs) enable novel light manipulation and sensing applications.
    • Existing vibration sensors may lack compactness, versatility, or tunable frequency response.

    Purpose of the Study:

    • To demonstrate a compact and versatile interferometric vibration sensor.
    • To utilize a symmetric strongly coupled MCF in a reflection-mode configuration.
    • To achieve tunable sensitivity for vibration detection.

    Main Methods:

    • A short segment of symmetric strongly coupled MCF was fusion spliced to a single-mode optical fiber (SMF).
    • The MCF segment was cleaved and configured as a cantilever, acting as the inertial mass.
    • Vibrations induced bending in the MCF cantilever, causing oscillations in the reflected interference spectrum.

    Main Results:

    • The sensor operated effectively in reflection mode.
    • The MCF cantilever configuration successfully translated vibrations into spectral oscillations.
    • The sensor's sensitive frequency range was tunable from Hz to kHz by adjusting cantilever dimensions.

    Conclusions:

    • A compact, versatile, and tunable interferometric vibration sensor based on MCF was successfully demonstrated.
    • The proposed sensor architecture offers a promising platform for various vibration sensing applications.
    • The ability to tailor the frequency response makes the sensor adaptable to diverse environmental conditions.