Abstract
A numerical investigation into the propagation of ultrashort light
pulses in the region of 1.55 mu m was conducted and the conversion
efficiency (CE) in four-wave mixing (FWM) generation of ordinary and
dispersion decreasing fibres for use in wavelength division multiplexing
(WDM) systems was investigated. The simulation studied six different
profiles: linear, hyperbolic, Gaussian, logarithm, exponential and
constant. For all the studied profiles there was a decrease in
conversion efficiency with an increase in channel separation. The CE for
the hyperbolic profile is around 10(3) times larger in magnitude
compared with the constant, logarithm and linear profiles at 0.2 nm.
Modulation instability was observed during the FWM signal propagation.
Typically, a frequency of modulation Delta f(MAX) similar or equal to 8
GHz at the beginning of the propagation of the mixing signal (15 km) was
obtained. For the Gaussian profile, where the modulation instability
(MI) is more efficient, and for a long propagation, the MI is growing
and more frequency satellites are present. It is concluded that with the
use of decreasing dispersion profile (DDF) fibres, control of the CE and
the compression factor of FWM generation in WDM systems can be achieved.
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