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 (0.02  m1), which is found to be only 2% of the total loss.

© 2018 Optical Society of America

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