FBG hybrid microfiber Sagnac ring refractive index sensor

Abstract

In this paper, we propose a fiber Bragg grating (FBG) hybrid microfiber Sagnac ring refractive index sensor for measuring the refractive index of liquid. The sensing part is composed of a section of single-mode fiber(SMF) that is almost etched to the core, which cascaded with the FBG and connected to the Saganc fiber ring structure. The experimental results show that the refractive index sensitivity of the sensor is 1787. 4nm/RIU, and its linearity is 98.95%. The sensor has high sensitivity, good linearity and high stability, and has a good application prospect.. (Abstract)