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Proceedings Paper

Orthogonal demodulation phase: shifting design of optical fiber hydrophone based on Hilbert transform
Author(s): Zhenxing Hou; Hailiang Wang; Yu Fu; Haiyan Zhang; Lei Zhang; Liangbin Hao; Baichao Zheng
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Paper Abstract

Orthogonal demodulation, as an important part of the demodulation process of heterodyne interferometric optic fiber hydrophone signal, directly determines whether the demodulation system can demodulate the underwater acoustic signal without distortion. The phase shift operation of reference signal is the key step of orthogonal demodulation algorithm. In this paper, the influence of phase shift error on the distortion of underwater acoustic signal is introduced and analyzed by combining the interferometric optic fiber hydrophone demodulation system, the phase shift range of undistorted signal is obtained by simulation analysis. Hilbert algorithm is proposed and used for phase shift of reference signal, to improve the phase shift accuracy, and then enhance the performance of orthogonal demodulation. Using the actual system to verify, it is proved that the heterodyne demodulation of optic fiber hydrophone based on Hilbert algorithm can demodulate the characteristics of underwater acoustic signals without distortion.

Paper Details

Date Published: 25 October 2017
PDF: 8 pages
Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046413 (25 October 2017); doi: 10.1117/12.2285029
Show Author Affiliations
Zhenxing Hou, Beijing Institute of Aerospace Control Devices (China)
Hailiang Wang, Beijing Institute of Aerospace Control Devices (China)
Yu Fu, Beijing Institute of Aerospace Control Devices (China)
Haiyan Zhang, Beijing Institute of Aerospace Control Devices (China)
Lei Zhang, Beijing Institute of Aerospace Control Devices (China)
Liangbin Hao, Beijing Institute of Aerospace Control Devices (China)
Baichao Zheng, Beijing Institute of Aerospace Control Devices (China)


Published in SPIE Proceedings Vol. 10464:
AOPC 2017: Fiber Optic Sensing and Optical Communications
Zi-Sen Zhao; Leping Wei; Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Kenneth T. V. Grattan, Editor(s)

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