A Detailed Analytical Derivation of the GN Model of Non-Linear   Interference in Coherent Optical Transmission Systems
  Recently, a perturbative model of non-linear fiber propagation in uncompensated optical transmission systems has been proposed, called GN-model [1]. Here, an extended and more detailed version of the GN-model derivation [1] is reported, providing deeper insight into the model. Some straightforward generalizations of the model are also proposed. 
Pierluigi Poggiolini, Gabriella Bosco, Andrea Carena, Vittorio Curri,   Yanchao Jiang, Fabrizio Forghieri
physics.optics