Journal
OPTICS EXPRESS
Volume 22, Issue 22, Pages 27681-27694Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.027681
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Funding
- Natural Sciences and Engineering and Research Council (NSERC) of Canada's Strategic grants program
- NSERC's Discovery Grants program
- Canada Council for the Arts' Killam Research Fellowships program
- Government of Canada's Canada Research Chairs program
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We demonstrate the use of fiber Bragg gratings (FBGs) as a monolithic temperature sensor from ambient to liquid nitrogen temperatures, without the use of any auxiliary embedding structure. The Bragg gratings, fabricated in three different types of fibers and characterized with a high density of points, confirm a nonlinear thermal sensitivity of the fibers. With a conventional interrogation scheme it is possible to have a resolution of 0.5 K for weak pure-silica-core FBGs and 0.25 K using both boron-doped and germanium-doped standard fibers at 77 K. We quantitatively show for the first time that the nonlinear thermal sensitivity of the FBG arises from the nonlinearity of both thermo-optic and thermal expansion coefficients, allowing consistent modeling of FBGs at low temperatures. (C) 2014 Optical Society of America
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