A High-Frequency Sound based PGC Demodulation Scheme for Fiber Optics Hydrophone

作     者：Shi, Yunjie Yin, Mengke Zhu, Zijue Wang, Shun Niu, Panting Dong, Yuming Zhang, Liang 

作者机构：Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Schools of Science Changchun University of Science and Technology Changchun130022 China 

出 版 物：《Research Square》 (Research Square)

年 卷 期：2021年

核心收录：

主　　题：Phase modulation 

摘      要：In the research field of fiber-optic hydrophone, the performance of demodulation scheme is crucial. In this work, a phase-generated-carrier (PGC) demodulation scheme based on high-frequency sound source is proposed. High-frequency acoustic signal from the external sound source is applied to the fiber-optic hydrophone to achieve phase modulation of the interference signal instead of the piezo-electrical transducer (PZT) or frequency-modulated laser. It possesses the merits of low system complexity and low cost. Through the acoustic detection experiment, we achieve demodulation of acoustic signal at frequency varying from 300 Hz to 800 Hz, and the signal-to-noise ratio (SNR) is higher than 45 dB. Furthermore, the proposed scheme is successfully applied to time division multiplexing (TDM) experiment. © 2021, CC BY.