Stabilized Fiber-Optic Fabry–Perot Acoustic Sensor Based on Improved Wavelength Tuning Technique

A fiber-optic Fabry–Perot acoustic sensor system based on an improved wavelength tuning stabilization technique is presented. The stabilization is achieved by wavelength periodically tuning using a tunable distributed feedback laser. The performance of the developed sensor system was verified by tests. Experimental results demonstrate that the sensitivity, the dynamic range, and the min detectable sound pressure level (SPL) are 92 mV/Pa, 96 dB, and 7 dB-SPL at 1 kHz, respectively. The sensor is suitable for weak acoustic sensing.