Study of the Radiation-Induced Optical Sensitivity in

Special fibres with different concentrations of erbium and aluminium have been fabricated and gamma irradiated. It is found that the normalised radiation-induced absorption increases with the erbium concentration. Normalised radiationinduced absorption can reach values as high as 0.02 dB/(m Gy) at 980 nm. Aluminium is identified to produce permanent optical losses