Orthogonal demodulation phase: shifting design of optical fiber hydrophone based on Hilbert transform

Zhenxing Hou; Hailiang Wang; Yu Fu; Haiyan Zhang; Lei Zhang; Liangbin Hao; Baichao Zheng

doi:10.1117/12.2285029

25 October 2017 Orthogonal demodulation phase: shifting design of optical fiber hydrophone based on Hilbert transform

Zhenxing Hou, Hailiang Wang, Yu Fu, Haiyan Zhang, Lei Zhang, Liangbin Hao, Baichao Zheng

Proceedings Volume 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications; 1046413 (2017) https://doi.org/10.1117/12.2285029
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

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.

Citation Download Citation

Zhenxing Hou, Hailiang Wang, Yu Fu, Haiyan Zhang, Lei Zhang, Liangbin Hao, and Baichao Zheng "Orthogonal demodulation phase: shifting design of optical fiber hydrophone based on Hilbert transform", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046413 (25 October 2017); https://doi.org/10.1117/12.2285029

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