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 10−12 was obtained with 223−1 pseudorandom patterns under a penalty-free condition.
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Nakazawa et al. (1992) studied this question.