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    Area of Science:

    • Optical Engineering
    • Sensor Technology
    • Mechanical Engineering

    Background:

    • Extrinsic Fabry-Perot accelerometers (EFPAs) are crucial for motion sensing.
    • Enhancing EFPA sensitivity and noise suppression remains a key challenge in sensor development.

    Purpose of the Study:

    • To propose and validate a novel sensitivity-enhancement method for EFPAs.
    • To leverage wavelength-division multiplexing (WDM) and opto-mechanical coupling (OMC) for improved accelerometer performance.

    Main Methods:

    • Developed a cascaded dual-interferometer cavity structure using an integrated filter-collimator.
    • Utilized opto-mechanical coupling (OMC) to induce a push-pull spectral shift in response to vibration.
    • Implemented a wavelength-division multiplexing (WDM) cascading scheme.

    Main Results:

    • Achieved a fourfold improvement in sensitivity compared to conventional EFPAs.
    • Demonstrated a maximum sensitivity of 29.38 nm/g at 460 Hz.
    • Maintained operational bandwidth while achieving a low noise level of 8.3 pm.

    Conclusions:

    • The proposed OMC-based EFPA design significantly enhances sensitivity through effective cavity length extension and increased spectral spacing.
    • The dual Fabry-Perot cavity configuration effectively suppresses common-mode noise.
    • This novel method offers a promising approach for developing high-sensitivity accelerometers without compromising bandwidth.