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Proceedings Paper

An improved PGC demodulation method to extend dynamic range and compensate low-frequency drift of modulation depth
Author(s): Lu Hou; Feng Peng; Jun Yang; Yonggui Yuan; Dekai Yan; Bing Wu; Libo Yuan
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Paper Abstract

In this paper, we propose an improved method of phase generated carrier (PGC) combined with 3×3 coupler to extend dynamic range and compensate low-frequency drift of modulation depth. The small amplitude signal(≤10-2 rad) is figured out by the PGC method to keep the minimum phase resolution and the large amplitude signal(≥10rad) can be calculated by the 3×3 fixed phase difference algorithm to extend the maximum amplitude of the dynamic range. We can get the same result to the signal with the normal amplitude(10-2 rad≤D≤10rad) by any two kinds of methods. Furthermore, the modulation carrier wave amplitude and frequency information can be monitored by the 3×3 auxiliary algorithm to compensate low-frequency drift of modulation depth and keep the system stability as a feedback. According to the result, the interferometer is able to resolve 2.0 ×10-5 rad/√Hz with a dynamic range of 182.2dB@10Hz frequency and 2Mbps sample rates.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96345Y (28 September 2015); doi: 10.1117/12.2195867
Show Author Affiliations
Lu Hou, Harbin Engineering Univ. (China)
Feng Peng, Harbin Engineering Univ. (China)
Jun Yang, Harbin Engineering Univ. (China)
Yonggui Yuan, Harbin Engineering Univ. (China)
Dekai Yan, Harbin Engineering Univ. (China)
Bing Wu, Harbin Engineering Univ. (China)
Libo Yuan, Harbin Engineering Univ. (China)


Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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