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2.2 OTDR Test Event Type
OTDR test event is an abnormal point that causes a sudden change in loss or reflected
power. Including all kinds of connection points in the optical fiber link, melting contact and
bending, crack or fracture and so on.
There are two main types of OTDR test events: reflection events and non reflective events.
2.2.1
Reflection Events
When measured along the optical fiber laser from the OTDR pulse, if the activity
connection point, or the end of the fiber, the refractive index due to mutation causes will produce
the phenomenon of reflection, will be part of the optical signal along the optical fiber. To return
to the instrument, the instrument through the acceptance of the reflected signals, will detect the
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