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Soliton WDM transmission of four signals at 20 Gbit/s over 2000 km of standard fibre is achieved, with 100 km dispersion-compensated spans using polarisation multiplexing and pre-chirping. Single-wavelength transmission was performed over 2400 km. Without polarisation multiplexing, the transmission was limited to 1500 km.
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Favre et al. (1997) studied this question.
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