Thermal stability of fiber Bragg gratings recorded under different conditions

In this work an experiment was performed to examine the thermal stability of fiber Bragg gratings recorded u sing both pulsed an d continuous-wave ultraviolet radiation. Thermal cycles of 30 minutes at temperatures varying from 25 to 260 o C have been applied to the fiber gratings in a dry environment. The changes in grating reflectivity and Bragg wavelength are analyzed as a function of the temperature and inscription condition.