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Study of the radiation-induced optical sensitivity in erbium and aluminium doped fibres

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.