The configuration analysis of fiber optic interferometer of hydrophones

This paper describes a configuration analysis of optical fiber interferometric hydrophones. We use mathematical methods to compare their characteristics and relation of sensitivity, delay fiber and physical frequency of the Sagnac type interferometer. In the experiment, we use PGC modulation technology and measure the sensitivity of the three types interferometer in this paper proposed. The preliminary results of the acoustic signal sensitivity are as follows: Michelson, compensating type Mach-Zehnder interferometer. Hybrid of a Mach-Zehnder and a Sagnac type interferometer are -201.67, -205.97, -212.47 dB re V/1 μPa, respectively.