A comparison between lumped and distributed filter models in wavelength-division multiplexed soliton systems

The effects of lumped and distributed filtering on soliton interactions are considered in a dispersion-managed transmission link when the dispersion steps approximate the lossramplification profile. A detailed comparison of the collision-induced timing shifts and corresponding timing jitter for both lumped and distributed filtering models is carried out. Ž . Ž . In particular, we show that: i there are some differences between the predictions obtained by the two models; however, ii Ž . in all cases of practical interest i.e., non-negligible bit error rates the estimates originating from the distributed model represent a good approximation to the results obtained with the lumped model. q 1999 Elsevier Science B.V. All rights reserved. PACS: 42.97.S; 22.65.Tg; 42.81.Dp