
436 Optical Fiber Communication Systems with MATLAB
®
and Simulink
®
Models
fully compensated ROA, EDFA amplication transmission multispan link is shown in
F
igure10.28
f
or
A
SK
4
0
G
b/s
m
odulation
f
ormat
a
nd
b
it
r
ate.
A
1
70
p
s/nm
d
ispersion
t
ol-
erance
i
s
ob
tained
f
or
t
his
m
ultispan
A
SK
4
0
G
b/s
t
ransmission
c
an
b
e
obs
erved.
T
his
i
s
m
ore
t
han
30
%
i
mprovement
a
s
c
ompared
t
o
E
DFA
o
nly
o
ptically
a
mplied
t
ransmission
o
ver
1
2
×
1
00km
t
ransmission
s
ystem
w
ith
d
ispersion
c
ompensating
bers
i
nserted
i
nto
each span and two EDFAs employed to compensate for the SSMF and DCF losses. Thus,
R
aman optical ampliers offer improvement over all EDFA mul ...