4 Gbit/s, 188 km optical fibre transmission experiment using three packaged laser amplifiers

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Abstract
We report 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 μm 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.