High-performance accelerometer array with chirped pulse modulation using reference interferometric architecture

This paper demonstrates a high-performance optical fiber disk accelerometer employing chirped pulse demodulation. The system design features a reference interferometer architecture that actively compensates for low-frequency phase noise originating from laser source fluctuations, achieving high precision in acceleration measurement along with effective noise suppression. Through the synergistic implementation of chirped pulse modulation and matched-filter processing, the proposed configuration enhances signal-to-noise ratio (SNR) while preserving spatial resolution integrity. Experimental result reveals the following performance metrics: a sensitivity of 30.97 rad/g over a 5-800 Hz operational bandwidth, accompanied by 12.84 dB phase noise reduction in the 1-20 Hz regime. At 5 kHz pulse repetition frequency (PRF), the system exhibits a high-frequency noise floor of -105 dB re g²/Hz, outperforming conventional IQ demodulation approaches by 15 dB. The introduction of a second-order time-domain difference unwrapping (TDU) algorithm further expands the dynamic range from 85.93 dB to 106.59 dB, facilitating distortion-free acceleration detection over extended spectral bandwidths.