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Reports on 4 Gbit/s optical fibre transmission experiments using three packaged laser amplifiers as linear optical repeaters. With total amplifier gain 32 dBm, a directly modulated 1.518 mu m DFB laser signal was transmitted over 188 km fibres, consisting of dispersion shifted fibres and conventional fibres for dispersion compensation. The overall system penalty was only 0.9 dB.<<ETX>>
The first optical fibre transmission experiment using an Er-doped optical fibre amplifier as an optical repeater is reported. With an optical repeater gain of 20 dB, 1.2 Gbit/s intensity-modulated optical signals were transmitted along a 218 km dispersion-shifted optical fibre without any optical filters and without any degradation.<<ETX>>
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