Yamasaki Y30 Series User Manual page 14

5.3.4 Non-reflection Event
Non-reflection event brings loss on the whole transmission link of optical fiber, but no light reflection. On
the curve, non-reflection event is shown as drop of optical power, as shown in Fig.6-3.
Fig.6-3 Non-reflection Event
5.3.5 Event Inspection
An OTDR sends an optical pulse into the optical fiber under inspection, then, begins to accept the returned
optical signal immediately, and calculates the distance of an "event" in the optical fiber. The further the
event is, the longer time it takes to return back to the OTDR. The distance can be calculated according to
the time when receiving the event. Through inspecting the curve of the reflected signal, the optical
transmission characteristics of optical fiber, connector and joint can be confirmed.
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