We introduce erbium-doped fibre amplifiers (mfa) into soliton-dragging logic gates (SDLG) to improve their performance in terms of switching energy, fanout and tolerance to timing jitter. In particular, we experimentally and numerically examine the frequency shifts associated with soliton dragging for orthogonally polarized pulses intera c h g in discrete and distributed amplifiers. We show that EDFA asymmetrize the interaction between pulses. leading to a frequency shift even when pulses

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... tely walk through each other. The gain can increase the fan-out andlor reduce the switching energy, while proper positioning of the amplifier can loosen the timing restrictions for SDLG. We find reasonable agreement between calculations and measurements in the disaete amplifier case. However, discrepancies for the distributed amplifier case may result from nonuniform gain profiles along the length of the amplifier.