Abstract
We did a numerical investigation of the propagation of short light
pulses in the region of 1.55 mu m and the conversion efficiency (CE) for
the four wave mixing generation (FWM) of ordinary and dispersion
decreasing fibers for use in wavelength division multiplexing (WDM)
systems, Our simulations studies three different profiles, linear,
hyperbolic. and constant, One conclude that for all the profiles there
is decrease of the conversion efficiency with the increase in the
channel separation. The hyperbolic profile present a higher efficiency
of around 1000 above in magnitude compared with the others profiles at
0.2 nm of channel separation. We calculate the conversion efficiency
versus the fiber length for the three profiles. The conversion
efficiency for the hyperbolic profile is higher when compared to the
constant and linear profiles. The other interesting point of the
hyperbolic profile is that the increase of the CE in the beginning of
the fiber does not show my oscillation in the CE value (log eta), which
was observed for the constant and linear profiles. For all the profiles
there is an increase of the conversion efficiency with the increase of
the pump power. The compression factor C-i for the generated FWM signal
at omega(3) was measured along the DDF's and the constant profile
fibers. One can conclude that with the use of decreasing dispersion
profile (DDF) fibers one can have a control of the (CE) conversion
efficiency and the compression factor of the four wave mixing (FWM)
generation in WDM systems. (c) 2005 Elsevier Inc. All rights reserved.
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