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distance that OTDR can test under the condition of the maximum test pulse width provided by the instrument.
Therefore, under the same link condition, the larger the dynamic range, the longer the distance of the optical
fiber link that the instrument can test.
The maximum test distance of OTDR is different, because the loss of the link under test is different.
Connectors, fuses and spectrometers are also factors that reduce OTDR test length.
(4) Event Blind Zone(EBZ) and Attenuation Blind Zone(ABZ)
Due to the influence of connection points or connectors, some parts of the link cannot be measured. OTDR
blind area is divided into event blind area and attenuation blind area, which are generated by Fresnel
reflection and expressed by the distance (m) .
Event Blind Zone: The shortest distance between the detection of Fresnel
reflection signal and the recognition of the next Fresnel reflection signal by
OTDR is defined by the pulse width less than 1.5dB of the peak value.
Attenuation Blind Zone: The shortest distance that from detecting Fresnel
reflection to normal testing backward Rayleigh scattering.The phase cannot
measure fusion loss due to adjacent large reflection.
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