Abstract
The fiber Bragg grating (FBG) is a passive optical fiber component with the refractive index modulated along the fiber length and has been widely applied in fiber sensing systems. High-temperature stable fiber gratings are promising for uses at high temperatures and attract extensive attention. In this paper, FBGs were inscribed in hydrogen loaded standard single mode fibers with the 248-nm excimer laser, and regenerated gratings were obtained through heat treatment. The shift of the central wavelength of the regenerated FBG had a good linearity with temperature, and the reflectivity of the regenerated FBG could almost keep unchanged at 800 °C.
Highlights
When a fiber Bragg grating (FBG) is used as a temperature sensor, it can be erased when operating for a long time at elevated temperatures
FBGs were inscribed in hydrogen-loaded single mode fibers and heat treated to get regenerated FBGs
The original FBGs were inscribed in hydrogen loaded standard single mode fibers made by Yangtze Optical Fiber and Cable Company Ltd., China
Summary
When a fiber Bragg grating (FBG) is used as a temperature sensor, it can be erased when operating for a long time at elevated temperatures. In order to extend FBG’s sensing applications to higher temperatures, high-temperature stable fiber gratings have been studied by different workers [1,2,3,4]. One way to improve the high-temperature sustainability of FBGs is heat-treating the FBGs to obtain regenerated FBGs [5, 6]. The studies on regenerated FBGs and the regeneration mechanism are important for FBG’s sensing applications and understanding the related essential issues. FBGs were inscribed in hydrogen-loaded single mode fibers and heat treated to get regenerated FBGs. The regenerated gratings are demonstrated to be stable at temperatures around 800 °C
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
