Radiation-Response of Fiber Bragg Gratings at Low Temperatures.

The radiation-resistance of different types of gratings, such as types I-UV, II-IR, and III, was investigated at −120 °C up to the accumulated dose of 100 kGy(SiO2). The grating temperature sensitivity was evaluated from room temperature down to −120 °C, before and after irradiation. We demonstrated no radiation effect on the temperature sensitivity at the accumulated dose of 100 kGy. This article is a preliminary one to explore the best candidate among the grating types for their integration in low-temperature applications and shows that the performances of both type II-IR and type III FBGs written in the F-doped fiber are not influenced by X-rays at −120 °C up to a dose of 100 kGy. [ABSTRACT FROM AUTHOR]