Abstract
Analytic expressions for four-wave-mixing terms in an ideal, lossless wavelength–division-multiplexed soliton system are derived with an asymptotic expansion of the -soliton solution of the nonlinear Schrödinger equation. The four-wave contributions are shown to grow from a vanishing background and then to decay. Their importance becomes evident in real, nonideal fibers, where they grow by an order of magnitude and equilibrate to a stable value as an effect of periodic amplification.
© 1997 Optical Society of America
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