FHO5000
15
2.5 Event Type
The events on trace are all the points that the value of power loss fluctuates abnormally. It usually contains various types of connection and
bending, crack, broken and etc. The event points marked on trace with special marks are the abnormal points in a fiber that cause the excursion of
a normal trace.
The events can be divided into Reflection-event and Non-reflection-event
Start event
The Start-Event on a OTDR trace is the initial point. Under the default setup, Start-Event is located on the first event(usually it is a connection
between the OTDR launching port and the connector of a fiber) of a fiber. It is a Reflection-event.
End event
The End-Event on a OTDR trace is the end point of a fiber. Under the default setup, End-Event is located on the last event(usually it is an end face
or a broken down point of a fiber). Usually, it is a Reflection-event.
Reflection-event
The phenomenon on a trace that some power of the optical pulse is reflected called a reflection event. Reflection-event is displayed as a peak
signal on a trace.
Non-reflection-event
The phenomenon on a trace that there exists some abnormal loss in a optical line, but no reflection occurred is called a Non-reflection-event. It is
displayed as a drop with no peak on a trace.
Event detection
OTDR launches a bunch of optical pulse into a under-test fiber, receives the returned optical signal and starts calculating the distance from a
event. The more the distance from the event is, the longer the returning time is cost. According to the receiving time, distance can be calculated. By
detecting the trace generated by the returned optical signal, the attributes of the fiber itself, the connector of the fiber, adaptor in the fiber and
splicing point in the fiber can be confirmed.
Start event or non
reflection event
Reflection event End event
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