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Proceedings Paper

The influence of parameters measurement error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone
Author(s): Kai Wang; Qingping Shi; Zhiguang Dai; Changdong Tian; Shangran Xie; Chang Yang; Shan Cao; Fajie Duan; Min Zhang; Yanbiao Liao
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Paper Abstract

The phase generated carrier (PGC) arctangent algorithm needs to be compensated when the carrier modulation depth C deviates from 2.63 rad. Parameters measurement error can induce an incomplete compensation in the arctangent algorithm. The demodulation distortion due to parameters estimation error is analyzed quantitatively in this paper. The relative amplitude error (RAE) and harmonic suppression ratio (HSR) are considered, which indicate a linear distortion and a nonlinear one separately. Theoretical analysis shows that the fluctuation range of RAE has a linear relation with an absolute value of δC which is the estimation error of the modulation depth C. The fluctuation range of RAE also has a square relation with δφ1, δφ2 which are the estimation error of the phase delay Δφ1Δφ2 of fundamental and second harmonic carriers respectively. Similarly, minimum HSR decreases by 6dB along with a doubled absolute value of δC and by 12dB with that of δφ1. Experimental results are presented to corroborate the theory.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 8421B6 (7 November 2012); doi: 10.1117/12.974817
Show Author Affiliations
Kai Wang, Tianjin Univ. (China)
Qingping Shi, Tsinghua Univ. (China)
Beijing Institute of Aerospace Systems Engineering (China)
Zhiguang Dai, Tsinghua Univ. (China)
Changdong Tian, Tsinghua Univ. (China)
Shangran Xie, Tsinghua Univ. (China)
Chang Yang, Tianjin Univ. (China)
Shan Cao, Tsinghua Univ. (China)
Fajie Duan, Tianjin Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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