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. 2015 Sep 14;5:13990. doi: 10.1038/srep13990

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(a) shows the optimum optical launch power per sub-channel versus the number of back-propagated sub-channels in MC-DBP; (b) shows the minimum required number of steps per fibre span in MC-DBP versus the number of back-propagated sub-channels. The markers are the simulation data, and the solid lines are the linear fit in (a), and the second-order polynomial fit in (b), respectively.