High Stability PGC-EFA-DCM Demodulation Algorithm Integrated with a PID Module

Phase generated carrier (PGC) demodulation technology has been widely used in fiber-optic interferometric sensors while nonlinearity is always accompanying with the scheme. We propose a highly stable PGC demodulation algorithm combining internal modulation, ellipse fitting algorithm (EFA), phase mod...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 40; no. 24; pp. 1 - 8
Main Authors Ge, Qiang, Zhu, Jianhui, Zhang, Gang, Cui, Yanyan, Xiao, Jian, Wang, Huisheng, Wu, Xuqiang, Yu, Benli
Format Journal Article
LanguageEnglish
Published New York IEEE 15.12.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Closed loops
Demodulation
ellipse fitting algorithm (EFA)
Elliptic fitting
Fiber optics
Fitting
Frequency modulation
Harmonic distortion
Heuristic algorithms
Lasers
Modulation
Modules
Nonlinearity
Phase generated carrier (PGC) demodulation
Phase modulation
phase modulation depth
proportion integration differentiation (PID)
Self calibration
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ISSN0733-8724
1558-2213
DOI10.1109/JLT.2022.3209018

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Summary:Phase generated carrier (PGC) demodulation technology has been widely used in fiber-optic interferometric sensors while nonlinearity is always accompanying with the scheme. We propose a highly stable PGC demodulation algorithm combining internal modulation, ellipse fitting algorithm (EFA), phase modulation depth ( C ) self-calibration and differential-cross-multiplying (DCM). A low frequency triangular signal is added to the laser modulation, which ensures the effectiveness of the EFA under small signal condition. And the real-time C value is calculated by using the ellipse fitting parameters and calibrated to the optimal value of 2.63 rad by a closed loop proportion integration differentiation (PID) module. Furthermore, nonlinear distortions are suppressed by the EFA. Experimental results show that the signal-to-noise and distortion ratio (SINAD) and total harmonic distortion (THD) of the proposed scheme are improved by 13.61 dB and 0.12% than the conventional PGC-DCM algorithm. The standard deviation of C decreased from 0.0178 rad to 0.0058 rad in 1024 seconds. The dynamic range, linearity and phase resolution of the system reach 117.73 dB @ 1 kHz, 99.99% and 4.6 μrad/√Hz, respectively.
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ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2022.3209018