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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

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 △C which is the estimation error of the modulation depth C. The fluctuation range of RAE also has a square relation with △φ1, △φ2 which are the estimation error of the phase delay △φ1 △φ2 of fundamental and second harmonic carriers respectively. Similarly, minimum HSR decreases by 6dB along with a doubled absolute value of △C and by 12dB with that of △φ1. Experimental results are presented to corroborate the theory.

Original languageEnglish
Title of host publication22nd International Conference on Optical Fiber Sensors
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event22nd International Conference on Optical Fiber Sensors - Beijing, China
Duration: 15 Oct 201219 Oct 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8421
ISSN (Print)0277-786X

Conference

Conference22nd International Conference on Optical Fiber Sensors
Country/TerritoryChina
CityBeijing
Period15/10/1219/10/12

Keywords

  • Arctangent demodulation algorithm
  • Carrier phase delay
  • Harmonic suppression ratio(HSR),modulation depth
  • Optical fiber hydrophone
  • Parameter estimation
  • Phase generated carrier(PGC)
  • Relative amplitude error(RAE)

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