
276 Optical Fiber Communication Systems with MATLAB
®
and Simulink
®
Models
of
these
DSPs
does
not
reach
this
rate.
Alternatively,
FPGAs
can
be
structured
in
parallel
form
t
o
p
erform
r
eal-time
p
rocessing.
In
in-line
ber,
an
optical
amplier
can
be
incorporated
in
front
of
the
PD
to
form
an
optical
receiver
with
an
optical
amplier
front
end
to
improve
its
receiving
sensitivity.
This
optical
amplication
at
the
front
end
of
an
optical
receiver
will
be
treated
in
the
chap-
ter
d
ealing
w
ith
o
ptical
a
mplication
p
rocesses.
The
structure
of
the
receiver
consists
of
three
parts,
namely,
the
front
end
section,
the
linear
channel
of
the
main
amplier,