The results of an experimental and theoretical study to compare the at
tributes of Pr3+-doped sulphide, chloride, mixed halide, fluoride and
chlorotellurite glasses for 1.3 mum fibre amplifiers are presented. Qu
antum efficiencies based on measured and calculated radiative and nonr
adiative rates are presented for each glass together with its 1.3 mum
fluorescence spectrum and an estimate of its loss.