The influence of parameters measurement error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone

Kai Wang; Qingping Shi; Zhiguang Dai; Changdong Tian; Shangran Xie; Chang Yang; Shan Cao; Fajie Duan; Min Zhang; Yanbiao Liao

doi:10.1117/12.974817

7 November 2012 The influence of parameters measurement error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone

Kai Wang, Qingping Shi, Zhiguang Dai, Changdong Tian, Shangran Xie, Chang Yang, Shan Cao, Fajie Duan, Min Zhang, Yanbiao Liao

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 8421B6 (2012) https://doi.org/10.1117/12.974817
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

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 δ_C which is the estimation error of the modulation depth C. The fluctuation range of RAE also has a square relation with δ_φ1, δ_φ2 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 δ_C and by 12dB with that of δ_φ1. Experimental results are presented to corroborate the theory.

Citation Download Citation

Kai Wang, Qingping Shi, Zhiguang Dai, Changdong Tian, Shangran Xie, Chang Yang, Shan Cao, Fajie Duan, Min Zhang, and Yanbiao Liao "The influence of parameters measurement error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 8421B6 (7 November 2012); https://doi.org/10.1117/12.974817

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