Fig. 1. Schematic diagram of a fiber optic interference system

Fig. 2. Schematic diagram of fiber optic hydrophone based on push-pull mandrel structure^［11-12］

Fig. 3. Deformation simulation of inner and outer elastic tube under 1 Pa acoustic pressure

Fig. 4. Deformation simulation of inner and outer elastic tube under 30 MPa hydrostatic pressure

Fig. 5. Experimental setup for fiber optic hydrophone measurement

Fig. 6. High hydrostatic pressure chamber for fiber optic hydrophone measurement

Fig. 7. Acoustic sensitivity test result