Abstract
The amplification of wavelength division multiplexed (WDM) data in fiber-optical
parametric amplifiers give rise to cross-gain saturation and four-wave mixing
crosstalk. This crosstalk affects the data quality, especially at higher input
powers. The statistics in this regime are nontrivial to obtain and we present,
for the first time, a model based on a combination of theory and numerics
that gives accurate statistics at a highly reduced computational cost. This
model is obtained from an exact solution of WDM data being amplified in the
strictly nonlinear regime which is derived in this paper. Using this model,
predictions of the bit-error rate (BER) can be obtained even at very low rates
impossible to reach by numerical methods alone. We show that there exists
no trivial relationship between the BER and the commonly used quality measure,
the Q-value. We also study how different amplifier parameters affect the statistics
and suggest design rules to reduce channel crosstalk.
© 2008 IEEE
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