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Results demonstrating that Er/sup 3+/ doped silica fibres may be operated as very efficient, high gain power amplifiers in the 1.55 mu m region are presented. For a pump wavelength of 1.48 mu m amplified output of 140 mW was obtained for 180 mW pump power and 1 mW signal input at 1.55 mu m. Pumping with higher powers at 0.98 mu m allows in excess of 500 mW output to be obtained for the same input...
A depressed-cladding, highly-germania-doped, distributed erbium-doped silica fibre amplifier has been fabricated exhibiting high gain and low dispersion. A gain of 27 dB over 10 km was achieved at 1.554 mu m. The fibre could be made transparent at this wavelength with only 15 mW pump power at 1.485 mu m. This is the lowest power requirement reported for lossless transmission.<<ETX>>
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