Probe Response of DFB Fiber Laser Hydrophone under Acoustic Vibration coupled Excitation

DFB fiber laser is cross sensitive to sound pressure signal and vibration signal. To the actual demand of the towed thin linear array based on DFB fiber laser hydrophone, the probe of symmetrical sensitized DFB fiber laser hydrophone was designed and packaged. In this paper, the sound sensitivity and acceleration sensitivity of the probe were calculated by finite element simulation respectively, and the experimental verification was carried out. Second, by acoustic vibration coupling experiment to simulate the actual working conditions, the probe was motivated by acoustic signal and acceleration signal, and the coupling experiment under acceleration sensitivity conform to the separate calculation of acceleration sensitivity. It preliminarily verified the sensor unit had both the high-pressure sensitivity and the low acceleration sensitivity. It was a foundation for the towed thin line array cable formation based on DFB fiber laser hydrophone.