Modeling of in-band crosstalk in WDM optical networks

In this paper, we analyze three different simulation models which allow the impact of in-band crosstalk on the transmission performances of wavelength division multiplexing (WDM) optical networks to be evaluated: an accurate simulation (AS), a Gaussian correlated noise (GCN) model, and a Gaussian wh ite noise (GWN) model. In the AS, an interfering channel is generated at ea ch node and added to the signal after an optical filtering. The final resul t must be averaged with respect to the message transmitted on the interferi ng channels and to the phases of the optical carriers. In the GCN the cross talk term is modeled as a Gaussian correlated noise, whose spectrum coincid es with that of the interfering channel. This model can be further simplifi ed if the noise is also assumed uncorrelated (GWN approximation). The resul ts obtained by these simulation models are also compared with those produce d by an analytical model allowing to evaluate the in-band crosstalk penalty .