High-resolution broadband phase interrogation for fiber optic interferometer using frequency stabilization and PGC demodulation

Wenzhu Huang; Wentao Zhang; Shuaijie Miao; Fang Li

doi:10.1117/12.2520915

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14 February 2019 High-resolution broadband phase interrogation for fiber optic interferometer using frequency stabilization and PGC demodulation

Wenzhu Huang, Wentao Zhang, Shuaijie Miao, Fang Li

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Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104844 (2019) https://doi.org/10.1117/12.2520915
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

We proposed an high-resolution broadband phase interrogation technique for an interferometric fiber optic sensor which is designed as an unbalance michelson interference structure. The frequency stabilization technique based on PoundDrever-Hall (PDH) method is used for reducing low-frequency phase noise of the laser. An (Piezoelectric Transition) PZT, acting on one arm of the interferometer, is used to generate additional phase modulation. A phase generation carrier (PGC) algorithm is proposed for phase demodulation. The experiment results show that the proposed system has a very wide wavelength detection capability (from 0.1 Hz to 500 Hz) with an ultrahigh resolution of 2 × 10^-4 rad@0.1 Hz, and better than 10^-5 rad in the frequency range from 1 Hz - 500 Hz.

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Wenzhu Huang, Wentao Zhang, Shuaijie Miao, and Fang Li "High-resolution broadband phase interrogation for fiber optic interferometer using frequency stabilization and PGC demodulation", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104844 (14 February 2019); https://doi.org/10.1117/12.2520915

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