Open AccessHigh-resolution slow-light fiber Bragg grating temperature sensor with phase-sensitive detection
Author(s) -
Arushi Arora,
Mina Esmaeelpour,
Martin Bernier,
Michel J. F. Digonnet
Publication year - 2018
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.43.003337
Subject(s) - fiber bragg grating , optics , materials science , fiber optic sensor , phosfos , optical fiber , phase (matter) , optoelectronics , polarization maintaining optical fiber , physics , quantum mechanics
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 (0.02 m -1 ), which is found to be only ∼2% of the total loss.