Non-dispersion-managed soliton amplification using distributed raman amplification

Optical soliton, amplified by the distributed Raman amplification (DRA), is numerically studied using more accurate method than previous works. In our work the DRA gain is actually designed by numerically solving the DRA equations, which include both the pump depletion and the soliton depletion. Our results predict that only the non-adiabatic region exists for the soliton amplification by DRA. The soliton behavior in the chain of DRA is found to be identical to the soliton amplification using the lump optical amplification, where the ratio of the amplifier span and the soliton period plays a dominant role in limiting the transmission distance.