1-13
IM AQ7280-01EN
Features
1
2
3
4
5
6
7
8
Index
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]
Multi Trace Analysis
You can load up to four waveforms that have been measured on the AQ7280 and display them
simultaneously for comparison. You can adjust the vertical display position of each loaded waveform.
2 Way Trace Analysis
Waveform events that have been measured from optical fiber cable end A to end B and those
measured from end B to end A can be combined. This combination enables displaying of events that
could not otherwise be measured because of dead zones.
In the figure below, the event that is in the near-end dead zone (point S) when measured from end A
is detected as event number 5 when measured from end B. In the 2 way trace analysis display, it is
displayed as event number 1.
AQ7280
End A
End B
End A End B
End A End B
S
1
2
3
4
E
AQ7280
S
1
2
3
4
E
5
S
1
2
3
4
E
5
2 way trace analysis
An event of the other waveform that exists within 6% of the position of an event of the current trace will
be considered part of the current trace event.
If multiple events of the other waveform that exists within 6% of the position of an event of the current
trace, the closest event will be considered part of the current trace event.
Waveforms that meet the following conditions can be combined.
• Both have the same wavelength.
• Both have the same pulse width.
• Their end position offset is within 6%.
• Both have event lists.
1.4 Optical Pulse Analysis
