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IM AQ1200-01EN
Event Mapper
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App
Index
20
Multi pulse width measurement
This function uses multiple pulse widths to measure the same route.
The following pulse widths are used.
Short pulse width: The near-end side events are measured. The value is set automatically by the
instrument according to the distance range (e.g., 10 ns).
Auto: The far-end side events are measured. The value is set automatically by the
instrument according to the distance range.
In an optical fiber cable measurement, reducing the pulse width of optical pulse measurement
increases the measurement resolution of the waveform in the near-end section but causes the optical
pulse to attenuate in the far-end section, preventing correct measurement.
Conversely, increasing the pulse width of optical pulse measurement allows correct measurement
in the far-end section but decreases the measurement resolution of the waveform in the near-end
section.
The multi pulse width measurement compensates for these measurement accuracy degradations
by performing optical pulse measurements using multiple pulse widths for the same wavelength and
showing the waveforms one by one on the screen.
The instrument automatically determines the far-end side pulse widths depending on the specified
distance range and wavelength.
Measurement
waveform using a
narrow pulse width
Increased waveform resolution
When the distance is long,
measurement is not possible.
Measurement
waveform using a
wide pulse width
Decreased waveform resolution
Events far away
can be measured.
17.1 Displaying Optical Fiber Events as Icons
