Interaction range and generation rate of nonlinear intrachannel signal distortion

Intrachannel cross-phase modulation and four-wave mixing are investigated in a pseudolinear transmission system. The interaction range of the nonlinear effects is studied numerically, and approximate analytical methods are used to explain the results and predict the necessary word length for general systems. The method is shown to agree with experimentally found data. The generation rate, i.e., the growth of the nonlinear distortion in different parts of the system is calculated numerically, and the possibilities for counteracting the generation of nonlinear signal distortion are discussed.