Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 37, Issue 3, Pages 927-932Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2018.2883824
Keywords
Distributed sensing; fiber Bragg grating; micro-cavity array; multiplexing
Funding
- Natural National Science Foundation of China, NSFC [61735013, 61575149]
- Natural Science Foundation of Hubei Province of China [2018CFA056]
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A micro-cavity array (MCA) fiber based on a dense ultra-short fiber Bragg grating (FBG) array is proposed for high-accuracy fully distributed sensing. In the MCA fiber, each pair of adjacent FBGs forms a micro-cavity, which acts as the sensing element. The high finesse interference spectra of the micro-cavities facilitate high demodulation accuracy. Large-scale multiplexing of 8557 FBGs results in 8556 micro-cavities in a 7.18-m MCA fiber. Combined with optical frequency-domain reflectometry, fully distributed temperature sensing with a spatial resolution less than 1 mm and measurement precision of 0.157 degrees C is demonstrated.
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