Abstract
We present a numerical investigation of the propagation and the
switching of fundamental solitons in a two-core nonlinear fiber coupler
constructed with periodically modulated dispersion fiber (PMDFC). Our
simulations are taking into account different amplitude and frequency
modulations of the PMDFC. The transmission characteristics. the critical
energy, the compression factor. the crosstalk (Xtalk) and extinction
ratio (Xratio) levels of the first order solitons were studied for low
to high pump energies. It was observed that for low modulation
frequencies. the augmentation of pump, power leads to an increase of the
critical energy and decrease of the transmission efficiency, For higher
modulation frequencies the effect in the critical energy is minimum but
at high pump powers the transmission is less efficient. The switched
pulses are broader for low frequency and high amplitude of modulation.
The Xtalk level is a decrease function with the increase Of Pump power.
however it is getting worse with the augmentation of the amplitude of
modulation, At higher frequencies. the increase of the amplitude
modulation is leading the Xtalk to a minimum as a function of pump
power. In summary, we have shown that the introduction of a periodically
modulated dispersion profile is leading the nonlinear directional
coupler to strong variations in the transmission efficiency, Xtalk and
Xratio levels as a function of the modulation amplitude and frequency as
well as pump energy. (c) 2004 Elsevier Inc. All rights reserved.
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