High stability PGC demodulation technique for fiber-optic interferometric sensor

Xiao Wenzhe; Cheng Jing; Zhang Dawei; Kong Yong; Ye Hualong; He Jun

doi:10.12086/oee.2022.210368

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Xiao W Z, Cheng J, Zhang D W, et al. High stability PGC demodulation technique for fiber-optic interferometric sensor[J]. Opto-Electron Eng, 2022, 49(3): 210368. doi: 10.12086/oee.2022.210368

Citation:

Xiao W Z, Cheng J, Zhang D W, et al. High stability PGC demodulation technique for fiber-optic interferometric sensor[J]. Opto-Electron Eng, 2022, 49(3): 210368. doi: 10.12086/oee.2022.210368

High stability PGC demodulation technique for fiber-optic interferometric sensor

1.
School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2.
Department of Materials Science, Fudan University, Shanghai 200433, China
3.
School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Fund Project: National Natural Science Foundation of China (61775140)

More Information

^*Corresponding author: dwzhang@usst.edu.cn

Received Date 17 November 2021

Revised Date 09 January 2022

Published Date 25 March 2022

Abstract

Abstract

The phase generated carrier (PGC) demodulation technique is widely used in distributed fiber-optic interferometric sensors, for its high sensitivity, good linearity, and large dynamic range. An improved PGC demodulation algorithm with single-path differential divide and the differential-self-multiplication (PGC-SDD-DSM) demodulation algorithm is proposed in this paper, the demodulation result of the PGC-SDD-DSM algorithm is not related to the carrier phase modulation depth (C) and light intensity disturbance (LID). The simulation and experiment results show that the proposed algorithm is insensitive to the C value, and compared with the single-path differential divide to PGC demodulation algorithm (PGC-SDD), the traditional differential-cross-multiplying (PGC-DCM) and PGC Arctangent (PGC-Arctan) demodulation algorithms, and the proposed algorithm has the best demodulation effect. When the proposed demodulation algorithm is applied in the optical fiber interferometric, it is found that the proposed algorithm can suppress the distortion caused by LID and C. The frequency of the signal to be demodulated is 1000 Hz, and the amplitude value is 2 rad. When the carrier modulation depth of 1.5 rad and the light intensity interference depth of 0.7 rad are introduced, the signal-to-noise and distortion ratio (SINAD) of the demodulation result using the improved PGC demodulation algorithm in the experimental system is 35.56 dB, which is 10.87 dB, 24.19 dB, and 6.38 dB higher than using traditional PGC-DCM, PGC-Arctan, and PGC-SDD demodulation algorithms, respectively. It is proved the system's stability improved effectively. This technology effectively promotes technical research in the fields of optical fiber sensors.
- optical fiber sensor /
- phase generated carrier (PGC) demodulation /
- phase modulation depth.

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References

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Overview

Overview

Phase generated carrier demodulation is widely used in distributed fiber-optic interferometric sensors. Traditional PGC demodulation methods include the PGC-DCM (differential-cross-multiplying), the PGC-Arctan (PGC Arctangent) demodulation methods, and the PGC-SDD (single-path differential divide) demodulation scheme proposed by previous researchers. While the demodulation results of those demodulation algorithms are influenced by light intensity disturbance or phase modulation depth, which affects the stability of the demodulation system. Here, high stability and low harmonic distortion PGC demodulation technique with single-path differential divide and differential-self-multiplication (PGC-SDD-DSM) is proposed, and the demodulation result of which is not affected by light intensity and C value shift of the phase modulation depth. The simulation results show that when the C value is 1.5 rad, 2.0 rad, 2.5 rad, 3.0 rad, and 3.5 rad, the amplitude of PGC-DCM, PGC-Arctan, and PGC-SDD demodulation algorithm changes obviously, while the result of PGC-SDD-DSM demodulation algorithm hardly changes. The improved PGC demodulation algorithm is applied to the experiment system, the system composed of two Mach-Zehnder fiber-optic interference sensors verifies the performance of the proposed PGC demodulation algorithm. The first Mach-Zehnder sensor is used to generate light intensity interference, and the second one is used to generate PGC modulation signals and test signals. When the modulation depth C value is 1.5 rad, the time domain and frequency domain demodulation result show the improved PGC demodulation algorithm can suppress the interference of light intensity, and its demodulation result is better than the other three algorithms. The signal to noise and disturbance ratio (SINAD) of the demodulation signal using the proposed PGC algorithm is 35.56 dB, which is 10.87 dB, 24.19 dB, and 6.38 dB, higher than those of the PGC-DCM, PGC-Arctan, and PGC-SDD algorithms, respectively. For the improved PGC demodulation algorithm, when the phase modulation depth C changes from 1.5 rad to 3.5 rad, the total harmonic distortion (THD) varies from 0.02% to 0.05%, and the SINAD varies from 35 dB to 37 dB. Compared with the other three demodulation algorithms, the SINAD and THD of demodulation signal using the improved PGC demodulation algorithm are better than others and hardly change with the change of C value, which indicates that the PGC-SDD-DSM demodulation algorithm has higher stability and lower harmonic distortion. At the same time, the improved PGC demodulation algorithm can also demodulate aperiodic signals with better frequency response and amplitude response. It is believed that the proposed PGC demodulation algorithm can be further developed in the field of optical fiber sensors.