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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
In order to asses the “error” in the evaluation of the Q-factor over a finite number
of bits, we consider the two extremes of the 95% confidence interval given by
Q
min
= Q 2 dev½Q
;
Q
max
= Q þ 2 dev½Q
:
(20.43)
The estimate range can be expressed as
range = Q
max
Q
min
(20.44)
and is given by
range = 20 log
10
1 þ
ffiffiffiffiffiffiffiffi
2
N
tot
r
1
ffiffiffiffiffiffiffiffi
2
N
tot
r
0
B
B
B
@
1
C
C
C
A
: (20.45)
This is a very useful formula, which shows that the Q-factor range is independent
from the Q-factor nominal value and is only dependent on the total number of
bits N
tot
. The following table reports this range in dB vs the number of simulated bits.
Number of simulated bits N
tot
Q-factor uncertainty ...
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Publisher Resources

ISBN: 9780123741721