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10 Gbit/s, 100 km nonrepeatered fibre transmission has been demonstrated using a high-sensitivity receiver with two-stage cascade-connected semiconductor optical amplifiers and a pin PD front end. The sensitivity and its improvement were −23.5 dBm and 12.2 dB respectively, resulting in the allowable span-loss of 24.5 dB.
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Nakano et al. (1990) studied this question.
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