Long-distance soliton transmission with a nonlinear twin-core fiber.

We numerically demonstrate soliton transmission over long distances in a new regime in which the soliton evolves in a two-core fiber over many dispersion lengths between successive amplifications. Shorter pulses than those transmitted in the average soliton dynamics regime are predicted, while a significant drift of the soliton mean frequency owing to the soliton self-frequency shift is observed and controlled by appropriate gain and loss parameters.