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An optical gain of 22 dB at 1.535 mu m is obtained in an Er/sup 3+/-doped fibre amplifier for a total pump power of 54 mW. The Er/sup 3+/ doping concentration is 34 p.p.m., and the pumping source is GaAlAs laser diodes at 820 nm. By using an Er/sup 3+/ fibre with a doping concentration of 390 p.p.m., the maximum gain is as high as 29.4 dB for a pump power of 83 mW.<<ETX>>
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