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Proceedings Paper

An improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm
Author(s): Feng Peng; Lu Hou; Jun Yang; Yonggui Yuan; Chuang Li; Dekai Yan; Libo Yuan; Hui Zheng; Zheng Chang; Kun Ma; Jiyong Yang
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Paper Abstract

In this paper, we present an improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm (EFA) to enhance the phase resolution and suppress the total harmonic distortion (THD) caused by the laser intensity disturbance (LID) of modulation phase. We make the subtraction operation to the outputs of the two 1×2 couplers to get the differential signals without DC offset, which is used to achieve the fixed phase demodulation. The EFA is applied to construct the standard quadrature signals with the two signals. The last output is utilized to finish the small amplitude (<2π rad) demodulation in PGC method, which can increase the phase resolution. The distortion signals caused by the LID effect can be eliminated by the EFA. According to the result, the phase error of the EFA is 0.03rad, the amplitude error is 5% and the phase resolution of system is 2.0×10-6rad/√Hz@1kHz (-106.3dB) with the THD is 5%.

Paper Details

Date Published: 10 August 2015
PDF: 6 pages
Proc. SPIE 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 96200S (10 August 2015); doi: 10.1117/12.2190842
Show Author Affiliations
Feng Peng, Harbin Engineering Univ. (China)
Lu Hou, Harbin Engineering Univ. (China)
Jun Yang, Harbin Engineering Univ. (China)
Yonggui Yuan, Harbin Engineering Univ. (China)
Chuang Li, Harbin Engineering Univ. (China)
Dekai Yan, Harbin Engineering Univ. (China)
Libo Yuan, Harbin Engineering Univ. (China)
Hui Zheng, The Earthquake Administration of Heilongjiang (China)
Zheng Chang, The Earthquake Administration of Heilongjiang (China)
Kun Ma, Binxan Seismic Station (China)
Jiyong Yang, Binxan Seismic Station (China)


Published in SPIE Proceedings Vol. 9620:
2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Xuping Zhang; David Erickson; Xudong Fan; Zhongping Chen, Editor(s)

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