High-Resolution Slow-Light Fiber Bragg Grating Temperature Sensor with Phase-Sensitive Detection
This Letter reports a slow-light fiber Bragg grating (FBG) temperature sensor with a record temperature resolution of ~0.3 m°C √Hz, a drift of only ~1 m°C over the typical duration of a measurement (~30 s), and negligible self-heating. This sensor is particularly useful for applications requiring the detection of very small temperature changes, such as radiation-balanced lasers and the measurement of small absorptive losses using calorimetry. The sensor performance is demonstrated by measuring the heat generated in a pumped Yb-doped fiber. The sensor is also used to measure the slow-light FBG's very weak internal absorption loss (0.02m-1), which is found to be only ~2% of the total loss.
A. Arora et al., "High-Resolution Slow-Light Fiber Bragg Grating Temperature Sensor with Phase-Sensitive Detection," Optics Letters, vol. 43, no. 14, pp. 3337-3340, Optical Society of America (OSA), Jul 2018.
The definitive version is available at https://doi.org/10.1364/OL.43.003337
Electrical and Computer Engineering
Keywords and Phrases
Slow light; Temperature sensors, Absorption loss; High resolution; Phase sensitive detection; Self-heating; Sensor performance; Temperature changes; Temperature resolution; Yb-doped fibers, Fiber Bragg gratings
International Standard Serial Number (ISSN)
Article - Journal
© 2018 Optical Society of America (OSA), All rights reserved.
01 Jul 2018