High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity

Gyeong Hun Kim; Joon Young Kim; Chang Hyun Park; Chang-Seok Kim; Hwi Don Lee; Youngjoo Chung

doi:10.1117/12.2267641

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23 April 2017 High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity

Gyeong Hun Kim, Joon Young Kim, Chang Hyun Park, Chang-Seok Kim, Hwi Don Lee, Youngjoo Chung

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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103235L (2017) https://doi.org/10.1117/12.2267641
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We propose a high speed strain measurement method using an active mode locking (AML) fiber Bragg grating (FBG) laser sensor with a chirped FBG cavity. The mode-locked frequency of the AML laser depends on both the position and Bragg wavelength of the FBG. Thus, the mode-locked frequency of cascaded FBGs can be detected independently along the cavity length of cascaded FBGs. The strain across FBGs can be interrogated dynamically by monitoring the change in mode-locked frequency. In this respect, the chirped FBG critically improves the frequency sensitivity to Bragg wavelength shift as a function of increasing dispersion in the AML cavity. The strain measurement of the FBG sensor shows a highly linear response, with an R-squared value of 0.9997.

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Gyeong Hun Kim, Joon Young Kim, Chang Hyun Park, Chang-Seok Kim, Hwi Don Lee, and Youngjoo Chung "High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235L (23 April 2017); https://doi.org/10.1117/12.2267641

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