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Optical-mechanical collaborative sensitivity enhancement for extrinsic fiber-optic Fabry-Perot accelerometers
Optics Letters
|May 1, 2026
Summary
This study introduces a novel sensitivity-enhancement method for extrinsic Fabry-Perot accelerometers (EFPAs) using wavelength-division multiplexing (WDM) and opto-mechanical coupling (OMC). The new design significantly boosts accelerometer sensitivity and suppresses noise.
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.
