Table of Contents
Advertisement
refractive index difference and the smoothness of the boundary surface.
The event of OTDR test refers to the abnormal point that causes abrupt change of loss or reflection power.
Including all kinds of connection points, fusion points and bending, cracks or breaks in optical fiber links,
which lead to the loss of transmission signals. They are mainly divided into two categories: reflective events
and non-reflective events.
(1) Reflective event
When OTDR transmits laser pulses along the measured optical fibers,
reflections will occur due to the sudden change of refractive index when it
encounters the active connection points or the end of the optical fibers. Some
optical signals will be returned to the instrument along the measured optical
fibers. The instrument will detect this reflection event by receiving the
reflected signal. On the OTDR test curve, there is an upward spike signal with
a certain width. The width and amplitude of the spike are mainly determined
by the pulse width used in the test and the reflected intensity.
6
Advertisement
Table of Contents
