Abstract
We describe a modified version of the split step Fourier transform algorithm
used to analyze the propagation of multi-channel optical pulses. The modified
algorithm divides the signal spectrum into separate envelopes, one for each
channel, and computes the evolution of a set of nonlinear Schrödinger
equations which accounts for the dispersion of both linear and nonlinear propagating
parameters. We choose four exemplary cases for which the performances of the
modified and standard split-step methods are compared in terms of computation
cost versus global error of the solutions. We show that the modified technique
is inferior when the spectrum is dense but it has a significant advantage
for sparsely occupied spectra and for cases when the linear and nonlinear
propagation parameters are dispersive.
© 2012 IEEE
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