1-9
IM AQ1200-01EN
Features
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Index
App
4 Point Markers
The AQ1200 uses the following four points to perform the measurement: the measurement start
point
1
, the splice loss start point
2
, the splice loss end point Y2, and the measurement end point
3
. At position
2
, the level difference between the approximated line
2
–
1
and the approximated
line Y2–
3
is calculated as the splice loss. The splice loss changes greatly depending on the
position of
2
. Set the correct position for
2
. The splice loss value changes depending on the
approximation method that you have specified. This can only be used when Marker Mode is set to
Marker.
Y2
b(dB)
e (dB)
c (km)
f (km)
Approximated line Y2–
3
2
1
3
5 Point Markers
The AQ1200 uses the following five points to perform the measurement: the near-end point (n), a
point (N) that is used to calculate the near-end side’s approximated line, a point (E) where splice
loss is detected, a point (F) that is used to calculate the far-end side’s approximated line, and the
far-end point (f). At position E, the level difference between the approximated line n–N and the
approximated line F–f is calculated as the splice loss. The splice loss changes greatly depending
on the position of E. Set the correct position for E. The splice loss value changes depending on the
approximation method that you have specified. This can only be used when Marker Mode is set to
Line.
n
N
f
F
a (dB)
b (dB)
c (km)
e (dB)
f (km)
E
Approximated
line F–f
Approximated
line n–N
Return Loss
Return loss RL is the ratio, in dB, of the reflected optical power level Pr to the incident optical power
level Pi. It is calculated using the following equation. The larger the return loss, the smaller the
reflected optical power. This implies that the performance of the measured optical line is good.
RL = –10log(Pr/Pi) [dB]
1.4 Waveform and Event Analysis
