High-Resolution And Large-Dynamic-Range Temperature Sensor Using Fiber Bragg Grating Fabry-Perot Cavity

A high-resolution and large-dynamic-range temperature sensor adopting a pair of fiber Bragg grating as Fabry-Perot cavity (FBG-FP) and laser frequency dither locking method is proposed and experimentally demonstrated. This sensor exhibits a temperature resolution of 7x10(-4) degrees C and a dynamic range of similar to 46 degrees C. It is especially useful for applications where very small temperature changes need to be detected, such as deep ocean temperature measurement. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement