The performance of 4x10 Gbit/s soliton transoceanic links based on sliding filtering and exponential dispersion management is evaluated both numerically and experimentally. Considering discrete N-step implementation, we show that the management rule is determinative for optimal performance. We also show that the required number N of steps is related to the amplifier spacing. Experimental WDM soliton transmission in a single-span recirculating loop with large 60 km-amplifier spacing and 4-step dispersion management is then described. Error-free distances over 15, 7 and 3.9 Mm have been obtained in 2, 3 and 4x10 Gbit/s WDM transmission, in close agreement with numerical results. The agreement validates other numerical predictions, showing substantial improvement in realistic straight-line implementation and error-free transmission over more than 9 Mm. In this last case, tolerance on actual fibre dispersion is also discussed.
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