250 km nonrepeated transmission experiment at 1.8 Gb/s using LD pumped Er 3+ -doped fibre amplifiers in IM/direct detection system

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Abstract
A nonrepeated fibre transmission experiment over 250 km is achieved at 1.8 Gb/s in a direct-detection repeater system using LD pumped Er3+-doped fibre amplifiers as pre and postamplifiers. Repeater gain of 50 dB is accomplished.