期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 29, 期 20, 页码 1707-1710出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2017.2742579
关键词
Optical fiber sensors; fiber Bragg gratings; curvature interrogation; microwave photonic filter
资金
- National Natural Science Foundation of China [61405166, 61775185]
- China Scholarship Council
- Generalitat Valenciana [APOSTD/2016/015, GVA PROMETEO 2013/012]
- Ministerio de Economia y Competitividad [TEC2014-60378-C2-1-R]
We propose and experimentally demonstrate an approach to perform high-resolution and temperature-insensitive interrogation of a fiber Bragg grating (FBG)-based multicore fiber (MCF) curvature sensor using a microwave photonics filtering technique. By combining two reflected sample signals from the two FBGs inscribed in MCF and a dispersion device, a two-tap notch microwave photonic filter (MPF) is formed. The notch frequency of MPF is dependent on the time delay difference between the two FBG reflected signals, which is related to wavelength spacing of the two FBGs. Due to the wavelength spacing of the two FBGs is proportional to the curvature, the curvature can be readily interrogated by monitoring the notch frequency of MPF. The proposed interrogation scheme with the sensitivity of 92 MHz/m(-1) is achieved, whilst the sensitivity can be easily adjusted. Moreover, the proposed interrogation scheme is temperature insensitive.
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