Energetic radiation influence on temperature dependency of Brillouin frequency in optical fibers

We present a post mortem study of the influence of energetic radiation on optical fiber Brillouin sensors, both Brillouin spectrum and its temperature dependency in two different fibers, a photosensitive optical fiber and a SMF28. The target application is nuclear wastes repository monitoring where optical fiber Brillouin sensors might be exposed to energetic radiation. UV exposure induced optical losses, Brillouin frequency shifts up to 28MHz and even a variation of the temperature dependency. The photosensitive optical fiber resulted more sensitive than SMF28™.