Thermal stability of fiber Bragg gratings in different fibers

Abstract

Thermal stability and temperature response are very important parameters for fiber Bragg gratings (FBG) to be used as sensors in high temperature applications. Experimental and theoretical analysis of the thermal erasure dynamics and temperature response of FBGs written in hydrogen-loaded and non hydrogen loaded photosensitive fibers has been carried out in the present investigation. The sensitivity and the behavior of wavelength shift of the gratings over the temperature range of 35°C to 1075°C are studied and reported. The regenerative property and anomalous behavior of the gratings were also studied.