A makeup-division method to suppress laser intensity modulation in PGC demodulation in optical fiber sensor

Xiya Chen; Jinzhi Ran; Na Zhang; Junfei Bi

doi:10.1117/12.2623739

27 March 2022 A makeup-division method to suppress laser intensity modulation in PGC demodulation in optical fiber sensor

Xiya Chen, Jinzhi Ran, Na Zhang, Junfei Bi

Author Affiliations +

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121693I (2022) https://doi.org/10.1117/12.2623739
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

This paper designed a makeup-division method to eliminate the influence of laser intensity modulation on signal demodulation when the phase-generated carrier (PGC) demodulation method is used in fiber optic hydrophones, and Total Harmonic Loss (THD) and Relative Amplitude Error (RAE) were used to evaluate the demodulated signal in terms of signal frequency and signal amplitude. Comparing the demodulation of the makeup-division method with the traditional demodulation method, the maximum value of THD (THDmax) has dropped from about -28dB to about -46dB, which is about 18dB, and the THDmax obtained by the division method is basically the minimum value of harmonic distortion for direct demodulation; for RAE, the direct demodulation valve of it is between -0.75dB and 0.65dB. After using the makeup-division method, the RAE is reduced to between -0.1dB and 0.02dB. It shows that the makeup- division method can effectively suppress the influence of laser intensity modulation. Additionally, the makeup-division method can track the relevant parameters of the laser FM signal in real time. The amplitude jitter and phase drift of the laser FM signal do not affect the demodulation effect. In the actual selection of 6.47km and 5.32km delay fiber, the test was carried out at the same time, and both had good demodulation effects.

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Xiya Chen, Jinzhi Ran, Na Zhang, and Junfei Bi "A makeup-division method to suppress laser intensity modulation in PGC demodulation in optical fiber sensor", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121693I (27 March 2022); https://doi.org/10.1117/12.2623739

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KEYWORDS

Demodulation

Modulation

Distortion

Detection theory

Fiber lasers

Signal detection

Fiber optics sensors

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