A closed-form approximate incoherent GN-model supporting MCI contributions

In this paper, a closed form formula for nonlinearity modeling in modern coherent fiber optic communication systems is derived based on the incoherent GN model. The model covers multi-channel interference (MCI). The effectiveness of the derived formula is shown particularly in near zero dispersion environment. Finally, accuracy of the derived formula is improved by adding correction factors based on a large data test set.