Research on PGC demodulation algorithm based on high stability

WANG Meng; KONG Yong; WU Hu; LI Huan; WANG Chunyang

doi:10.7510/jgjs.issn.1001-3806.2022.04.017

LASER TECHNOLOGY > 2022 > 46(4): 545-550. > DOI: 10.7510/jgjs.issn.1001-3806.2022.04.017

WANG Meng, KONG Yong, WU Hu, LI Huan, WANG Chunyang. Research on PGC demodulation algorithm based on high stability[J]. LASER TECHNOLOGY, 2022, 46(4): 545-550. DOI: 10.7510/jgjs.issn.1001-3806.2022.04.017

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Research on PGC demodulation algorithm based on high stability

Department of Electronic Information, School of Electrical and Electronic Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

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Received Date: May 20, 2021
Revised Date: June 10, 2021
Published Date: July 24, 2022

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Abstract

In order to solve the demodulation distortion caused by light intensity disturbance and modulation depth drift in traditional phase generated carrier (PGC) demodulation algorithm, an improved PGC demodulation algorithm based on fundamental wave mixing and differential self multiplication was adopted. And relevant theoretical analysis and simulation verification were carried out. The results show that the distortion caused by light intensity disturbance can be suppressed, and the demodulation efficiency can be improved at the same timeby using this algorithm. When the light intensity disturbance of 1.5rad~3.5rad was introduced, the signal-to-noise and distortion ratio of nearly 30dB was obtained, which was 15dB higher than the traditional discrete cosine transform (PGC-DCM) algorithm. In addition, the dependence on modulation depth C can be eliminated, and the total harmonic distortion of less than 0.1% and the signal-to-noise ratio of 30dB can be achieved, which was nearly 10dB higher than the traditional algorithm, and the corresponding linearity was up to 99.99%. It provides a new scheme for the demodulation of optical fiber interferometric sensor.
- optical communication,
- demodulation distortion,
- light intensity disturbance,
- modulation depth

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