期刊
OPTICS AND LASER TECHNOLOGY
卷 111, 期 -, 页码 95-99出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2018.09.046
关键词
Optical sensors; Modal interference; Fiber optics; Few-mode dual-concentric-core fiber (FM-DCCF)
We report on a compact strain-insensitive fiber temperature sensor based on a few-mode dual-concentric-core fiber (FM-DCCF). The proposed sensor simply involves a section of FM-DCCF spliced to lead-in and lead-out single-mode fibers (SMFs). The FM-DCCF with unique refractive index distribution supports a few number of guided modes. The high-order mode in the FM-DCCF is coupled from the fundamental mode in the lead-in SMF, and then the interference spectrum of them can be obtained in the lead-out SMF. By monitoring the variation of the wavelength, the sensor can be applied in temperature measurement with a sensitivity as high as 52.79 pm/degrees C. In addition, the wavelength drift of the sensor is almost immune to the cross impact of axial strain with the sensitivity of 0.23 pm/mu epsilon.
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