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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
281Direct Detection Optical Receivers
7.4.4.1  Shot
 N
oises
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
a
nd
(
2)
p
hoto
c
urrents
g
enerated
b
y
t
he
p
hotodiode
For
a b
ias
c
urrent
I, t
he
s
pectral
c
urrent
n
oise
d
ensity S
I
is given by
S
d i
df
qI
I
N I
=
( )
=
,
2
2
2 A /Hz (7.8)
where
q
is
the
electronic
charge.
The
current
i
N,I
represents the noise current due to the
biasing
c
urrent
I.
7
.4.4.2  Quantum
 S
hot
 N
oise
The average current
i
s
2
generated by the PD by an optical signal with an average optical
power P
in
is given ...
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Publisher Resources

ISBN: 9781482217513