Heating standard telecommunication Ge-doped silica fibres to 1200 degrees C removes the ultraviolet absorption bands believed to be responsible for photosensitivity. Losses at 480 nm induced by exposure to 249 nm laser light are reduced from 30 dB/m to less than 0.8 dB/m in the annealed fibre.

Electronics Letters
Department of Electronics

Albert, J, Malo, B., Johnson, D.C., Bilodeau, F., & Hill, K.O. (1992). Elimination of photoinduced absorption in Ge-doped silica fibres by annealing of ultraviolet colour centres. Electronics Letters. doi:10.1049/el:19921017