A co-vibrating three-dimensional optical fiber vector hydrophone(OFVH)based on the optical fiber accelerometer with integrated structural design is proposed.Utilizing the integrated structural design and its working principle of mass-spring system,the optical fiber accelerometer with integrated structural design is developed.On this basis,a three-dimensional OFVH is designed and fabricated using the push-pull configuration and six optical fiber accelerometers.The OFVH is measured using standing wave tube comparison method and differential delay heterodyne demodulation technique,the results show that the OFVH has a relatively flat frequency response of acceleration phase-shifted sensitivity in the frequency range of 20-500 Hz.For the X channel,the average sensitivity is about 34.7 dB(re.1 rad/(m·s-2)),close to the sound particle vibration theoretical calculation result(36.5 dB)and the finite element simulation result(35.5 dB).
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