Effects of four-wave mixing crosstalk in WDM networks on the transmitted optical frequencies and wavelengths of channels for various fiber types

We present a comprehensive theoretical study of four-wave mixing in optical fiber with exploring four fiber types. The four-wave mixing induced crosstalk noise is described by an expression that is based on NLS equation, and it describes the mutual channel interference optical losses in multi channel optical communications system. The corresponding system of equations has then been numerically integrated, and the channels interaction phenomena such as four-wave mixing have been described. System performance is evaluated through determining the average bit error rate relation with both of the frequency and wavelength of transmitted optical channels in the presence of four-wave mixing crosstalk noise. Various types of optical fiber have been used in the numerical results. The results can be generalized for all other types of optical fiber.