2 Additional Features Events
68 E6000C Mini-OTDR User’s Guide, E0302
Events
Events are changes in the fiber causing the trace to
deviate from a straight line. Events can be Reflective or
Non-Reflective.
Reflective Events Reflective Events occur when some of the pulse energy is
reflected, for example at a connector. Reflective Events
produce a spike in the trace (you see a steep rise and fall
in the graph: see the first diagram below).
Non-Reflective Events Non-Reflective Events occur at parts of the fiber where
there is some loss but no light is reflected. Non-Reflective
Events produce a dip on the trace (see the second
diagram below).
The OTDR calculates the distance of such an “event” in
the fiber from the time it takes the reflected signal to
return. The further away an event is, the longer it takes
for its reflection to return to the OTDR.
By examining the trace of the reflected signal, the
parameters of the fiber and the connectors, splices and so
on can be determined.
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