
390 Optical Fiber Communication Systems with MATLAB
®
and Simulink
®
Models
–30
–20
–10
0
10
20
30
–40 –30 –20 –10 0 10
20
P
out
(dBm)
P
in
(dBm)
P
in
vs. P
out
1566
1570
1580
1590
1600
0
10
20
30
40
50
60
–40 –30 –20 –10 0 10 20
Gain (dB)
P
in
(dBm)
Gain vs. P
in
(b)
(a)
1566
1570
1580
1590
1600
FIGURE 9.37
EDFA
g
ain
v
ersus
i
nput
s
ignal
p
ower
le
vel
f
or
L
-band
(
a)
o
utput
p
ower
v
ersus
i
nput
le
vel
(
b)
g
ain
a
gainst
i
nput
p
ower level.
–10
–5
0
5
10
15
20
1530 1540 1550 1560 1565 1566 1570 1580 1590 1600
Wavelength (nm)
C-band and L-band gain comparison
–20
FIGURE 9.38
EDFA gain spectrum.