Split-Step-Fourier-Method in Modeling Wavelength-Division-Multiplexed Links

We review different variants of split-step-Fourier-method (SSFM) used for simulation of wavelength-division- multiplexed links. We analyse single-band as well as multi-band methods. Local-error-method (LEM) is especially useful in single-band simulations, because it automatically adjust simulation step for required accuracy. For large number of WDM channels all single-band methods, including LEM, show prohibitively long simulation time. In this case multi-band methods are being used. We evaluate different multi-band methods and propose application of LEM method to cross-phase modulation (XPM) simulation in place of fixed step, which improves simulation speed and accuracy.