p$arepsilon$-Resolution Fiber Grating Sensor With Adjustable Measurement Range and Ultralow Probe Power

摘要

A novel active fiber grating sensor system based on injection-locking and Pound–Drever–Hall techniques is presented. In demonstrational experiments,$ext{p}oldsymbol {arepsilon }$-level strain resolution is achieved with a very low probe power down to −70 dBm, which is at least 50 dB lower compared with the classical Pound–Drever–Hall technique. Besides, the measurement range of the sensor can be adjusted over a large scale up to 17 dB by changing the injection ratio. With the ultrahigh resolution, ultralow probe power, and adjustable measurement range, the proposed sensor has great potential in high-resolution and large-scale sensor networks.