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(2) Non-reflective event
When OTDR pulses propagate along the measured optical fibers, such as
where there is a partial loss of energy due to fusion or bending, there is no
abrupt change in refractive index, so the reflection phenomenon will not occur
or can be ignored. OTDR can detect the non-reflective event parameters at the
OTDR receiver through backscattering. The non-reflective event shows a
signal of energy decrease on the OTDR test curve, and its decreasing range
indicates power loss.
(3) Dynamic Range
The dynamic range is an important parameter of OTDR,
which takes dB as unit. This parameter is expressed as the
maximum optical loss that OTDR can analyze when the
backscattering level from the output port of the instrument is
reduced to a specific noise level. In the actual use of OTDR,
this parameter is usually measured by the farthest fiber link
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