Constant step-size analysis in numerical simulation for correct four-wave-mixing power evaluation in optical fiber transmission systems
01 January 1999
Accurate evaluation of four-wave-mixing (FWM) contributions is one of the most time consuming problems in numerical simulations of wavelength-division-multiplexed lightwave systems, A too large constant step size can lead to widely overestimate the output FWM power. In this letter, for the first time to our knowledge, we analyze the maximum allowed constant step size to be utilized in split-step Fourier method simulations, for obtaining a given accuracy in the FWM power evaluation. A very general rule is given, valid for any possible value of fiber dispersion, channel separation, channel power and number of channels considered in the simulation.