Title

High-Resolution Slow-Light Fiber Bragg Grating Temperature Sensor with Phase-Sensitive Detection

Abstract

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.

Department(s)

Electrical and Computer Engineering

Comments

Funding: Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0383); Canada Foundation for Innovation (CFI); Northrop Grumman; Natural Sciences and Engineering Research Council of Canada (NSERC) (CG112389).

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)

0146-9592; 1539-4794

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Optical Society of America (OSA), All rights reserved.

Publication Date

01 Jul 2018

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