
411MATLAB
®
Simulink
®
Modeling of Raman Amplication and Integration
Figure10.6
shows
the
evolution
of
the
distributed
gain
under
both
backward
and
for-
wardpumping.
The
pump
power
is
shown
to
reduce
to
provide
gain
for
the
signal
power;
this
i
s
d
ue
t
o
p
ump
d
epletion
a
s
s
hown
i
n
F
igure
1
0.7.
The
signal
power
evolution
shows
how
it
changes
the
attenuation
map
in
comparison
to
the
passive
ber,
with
no
Raman
amplication.
In
the
forward
conguration,
there
is
a
large
gain
in
power
at
the
beginning
of
the
ber
length.
This
results
in
increasing
effects
of
nonlinearities
in
the
ber
because
of
the
power
dependence
of
the
refractive
indices
of
the ...