Interactions of differential phase-shift keying (DPSK) dispersion-managed (DM) solitons and jitter in long haul fiber links with lumped in-line filters

We formulate a model for investigating the transmission of date coded in the differential-phase-shift-keying (DPSK) format by soliton streams in the model of the dispersion-managed (DM) fiber link with in-line filters. First, we consider the transmission of the simplest two- and three-soliton strings, and then long multi-soliton ones. Summarizing results of systematic simulations, we identify a range 1.55 ≤ S ≤ 1.95, which provides for the optimal transmission regime (which is defined as that in which the bit-error-rate, BER, is kept below an acceptable limit, for a fixed large transmission distance). We also identify an interval of values of the filters´ bandwidth to guarantee an optimal operation regime. The simulations of the model with and without the amplified-spontaneous-emission (ASE) noise demonstrate that the limit on the transmission distance, necessary to keep BER below the acceptable level, is determined solely by the inter-soliton interactions, rather than by the ASE noise.