Modeling and experimental verification of polarization errors in Sagnac fiber optic current sensor

Every optical state polarization in Sagnac fiber optic current sensor (S-FOCS) is restricted in specific stage theoretically. However, complex transforming processes of optical state polarization induce illegal linear optical state polarization and illegal circular optical state polarization in Sagn...

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Bibliographic Details
Published in:Optik (Stuttgart) 2015-10, Vol.126 (20), p.2743-2746
Main Authors: Wang, Lihui, Cao, Min, Liu, Qingchan, Wei, Guangjin, Li, Bo, Lin, Cong
Format: Article
Language:English
Subjects:
Bias stability
Fiber optic current sensor
Optical state polarization
Scale ratio
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Summary:Every optical state polarization in Sagnac fiber optic current sensor (S-FOCS) is restricted in specific stage theoretically. However, complex transforming processes of optical state polarization induce illegal linear optical state polarization and illegal circular optical state polarization in Sagnac fiber optic current sensor, then, decrease performance of S-FOCS. According to the parameters of the optical components, we built Jones matrixes and the mathematical model of optical transmission in S-FOCS. Based on polarization state error models of Sagnac fiber optic current sensor, we made experiments to evaluate performances of several key components, including polarizer, quarter-wave retarder and sensing head, then, investigate the influence of several main polarization error factors on S-FOCS's performance practically. The result shows that the changing degree of polarization state causes bias instability, nonlinear of scale ratio, and random noises of S-FOCS, and influents S-FOCS's performance.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2015.06.063