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Optical Fiber Telecommunications VB, 5th Edition
book

Optical Fiber Telecommunications VB, 5th Edition

by Ivan Kaminow, Tingye Li, Alan E. Willner
July 2010
Intermediate to advanced content levelIntermediate to advanced
928 pages
33h 42m
English
Academic Press
Content preview from Optical Fiber Telecommunications VB, 5th Edition
where T is the bit duration, we find
s
=
P
s
T
hf
= N
s
;
(3.35)
where N
s
= P
s
T= hf means the number of photons per bit.
However, the homodyne phase-diversity rece iver can generate the complex
amplitude given by Eqn (3.20) at the baseband. Therefore, the mean square of
the signal photocurrent is given as
jI
c
ðtÞj
2
= R
2
P
s
P
LO
. When reconstructing the
complex amplitude, we need to add shot noises due to the LO powers of P
LO
=2
from the two ports. The receiver bandwidth at the baseband is B=2 = 1=2T; there-
fore, the total noise current is given as eP
LO
B. We can thus obtain the SNR
s
= P
s
=hfB = N
s
, which is the same as the heterodyne receiver. Even when
the polarization ...
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Publisher Resources

ISBN: 9780123741721