Presentation Information
[WC1-6]Long-Range DAS Utilizing Cascaded Acousto-Optic Modulators and Frequency-Shifting Loop
○Yimin Luo, Qingwen Liu, Chaozhu Liu, Xinyu Fan, Zuyuan He (Shanghai Jiao Tong Univ.)
Keywords:
Distributed fiber optical sensing,fibers and fiber devices for sensing,Fiber sensing application incl. environmental monitoring using optical network
A long-distance, high-spatial-resolution distributed acoustic sensor (DAS) based on cascaded acousto-optic modulators (AOMs) in frequency-shifting loop (FSL) was proposed. The system achieves a vibration frequency response bandwidth of 1 kHz over a detection range of 50 km. Experimental results demonstrate successful recovery of a 600 Hz vibration waveform at a distance of 40 km, with a signal-to-noise ratio (SNR) of 25 dB, a spatial resolution of 3 m, and a strain sensitivity of 116 pε/√Hz.