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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
323Digital Coherent Optical Receivers
8.3.1.2  PSK
 C
oherent
 S
ystem
Under the phase shift keying modulation format, the detection is similar to that of
Figure 8.4
for
heterodyne
detection,
but
after
the
BPF,
an
electrical
mixer
is
used
to
track
the
p
hase
o
f
t
he
d
etected
s
ignal
(
Figure
8
.6).
T
he
r
eceived
s
ignal
i
s
g
iven
b
y
r t P P t t n t n t
s LO IF x IF y IF
( ) cos[( ) ( )] cos( ) sin( )= + + +2 ω ϕ ω ω (8.18)
The information is contained in the time-dependent phase term ϕ(t).
When
the
phase
and
frequency
of
the
voltage
control
oscillator
(VCO)
are
matched
with
those
o
f
t
he
s
ignal
c
arrier,
t
hen
t
he
r
eceived
e
lectrical
s
ignal
c
an
b
e
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Publisher Resources

ISBN: 9781482217513