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Optical soliton data signals at 20 Gbit/s have been successfully transmitted for the first time over a 1020 km-long dispersion-shifted fibre. Erbium-doped fibre amplifiers were installed as optical 1R repeaters at every 50 km. A bit error rate of below 10/sup -12/ was obtained with 2/sup 23/-1 pseudorandom patterns under a penalty-free condition.<<ETX>>
Femtosecond optical pulses have been successfully generated for the first time using a distributed-feedback laser diode (DFB LD), erbium-doped optical fibre amplifiers, and the soliton narrowing effect in dispersion-shifted single-mode fibres. The DFB LD was gain-switched by a 500 MHz comb generator, and the pulse was converted into high power soliton pulses using a narrowband spectral windowing technique...
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