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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
cumbersome demodulation scheme is to use m/2 ODIs with the following different
phase offsets (between the two arms of each ODI).
D
ODI
ðnÞ=
1 2 n 1ðÞ½p
m
; n = 1; 2;:::;m=2:
(4.21)
For example, the demodulation of an 8-ary DPSK signal thus requires four
ODIs with phase offsets of /8, /8, –3/8, and –5/8 between the interfering
arms. Following the demodulation, m/2 pairs of balanced detectors are needed to
obtain m/2 decision variables, u[D
ODI
(n)], where n = 1, 2,..., m/2. Generalizing
the analysis on 8-ary DPSK to m-ary DPSK, we can recover the log
2
(m) data
tributaries of an m-ary DPSK signal by [36]
c
1
=c
I
¼ u
p
m

>0
hi
; c
2
¼c
Q
¼ u
p
m
p
2

>0
hi
;
c
3
¼ u
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Publisher Resources

ISBN: 9780123741721