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 μm. The fibre could be made transparent at this wavelength with only 15 mW pump power at 1.485 μm. This is the lowest power requirement reported for loss transmission.
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Davey et al. (1990) studied this question.