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http://dx.doi.org/10.5207/JIEIE.2012.26.2.044

Demodulation of FBG and Acoustic Sensors Embedded in a Fiber-Optic Sagnac Loop  

Kim, Hyun-Jin (전북대학교 전자공학부)
Lee, June-Ho (호서대학교 전기공학과)
Song, Min-Ho (전북대학교 전자공학부)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.26, no.2, 2012 , pp. 44-50 More about this Journal
Abstract
When the fiber Bragg gratings are embedded in a fiber-optic Sagnac loop for measuring temperature or strain, it is difficult to separate the Bragg wavelengths. The transmitted light is mixed with the reflected Bragg wavelengths in the photo-detector, working as noises. To suppress the noises, we placed the FBG sensors and a fiber-optic attenuator at asymmetric positions in the loop. With the arrangement the reflected light became much bigger than the transmitted light, enabling the separation of the reflected Bragg wavelengths with almost the same signal-to-noise ratio of the FBG sensors outside the loop.
Keywords
Fiber Bragg Gratings; Sagnac Loop; Interferometer; Attenuator; Acoustic Sensor; Temperature Sensor;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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