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Optical Fiber Communication Systems with MATLAB® and Simulink® Models, 2nd Edition
book

Optical Fiber Communication Systems with MATLAB® and Simulink® Models, 2nd Edition

by Le Nguyen Binh
December 2014
Intermediate to advanced content levelIntermediate to advanced
899 pages
32h 28m
English
CRC Press
Content preview from Optical Fiber Communication Systems with MATLAB® and Simulink® Models, 2nd Edition
296 Optical Fiber Communication Systems with MATLAB
®
and Simulink
®
Models
7.5.4.2.1
Noise Generators
Electrical shot noises are generated by the random generation of streams of electrons (cur-
rent).
In
optical
detection,
shot
noises
are
generated
by
(1)
biasing
currents
in
electronic
devices and (2) photocurrents generated by the photodiode.
A
b
iasing
c
urrent
I g
enerates
a s
pectral
c
urrent
d
ensity
S
I
given by
S
d i
df
qI
I
I
= =
( )
2
2 in A /Hz
2
(7.65)
where
q
is
the
electronic
charge.
The
quantum
shot
noise
i
s
2
generated by the PD by an
optical
s
ignal
w
ith
a
n
a
verage
o
ptical
po
wer
P
in
is given by
S
d i
df
q i
Q
s
s
= =
2
2
2 in A /Hz
2
(7.66)
When
A
PD
i
s
u
sed
t ...
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Publisher Resources

ISBN: 9781482217513