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Soliton data signals at 20 and 40 Gbit/s have been successfully transmitted over 2000 and 1000 km, respectively, by using erbium-doped fibre amplifiers. Bit error rates of below 10/sup -10/ were obtained with 2/sup 23/-1 pseudorandom patterns. 40 Tbit/s km is the highest value yet reported in a straight-line soliton transmission experiment.<<ETX>>
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