Abstract
Generation of self-similar parabolic pulse is analytically and numerically
demonstrated by designing parabolic index normal dispersion decreasing fiber
(NDDF) amplifiers. The pulse transmission is extensively studied for NDDFs
in presence of physical gain as well as virtual gain induced by two different
dispersion profiles corresponding to two different physical gain coefficients.
Here, we introduce the virtual gain arising from the unavoidable spatial nonlinear
variation, which helps to obtain the self-similar parabolic pulses at smaller
optimum length in comparison to NDDF with constant nonlinearity. The output
power profiles resemble with a perfect parabolic shape giving rise to self-similar
pulses with very small misfit parameters. Pulse propagation in presence of
spatial gain variation is also studied. To avoid fabrication difficulties,
we propose equivalent staircase dispersion profiles consisting of a number
of constant dispersion fibers (CDFs), which are simple to manufacture and
show performances excellently close to that of the proposed NDDF.
© 2009 IEEE
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