6-13
Reference
Cleaning Connections for Accurate Measurements
Inspecting Connectors
Because fiber-optic connectors are susceptible to damage that is not immedi-
ately obvious to the naked eye, bad measurements can be made without the
user even being aware of a connector problem. Although microscopic exami-
nation and return loss measurements are the best way to ensure good connec-
tions, they are not always practical. An awareness of potential problems, along
with good cleaning practices, can ensure that optimum connector perfor-
mance is maintained. With glass-to-glass interfaces, it is clear that any degra-
dation of a ferrule or fiber endface, any stray particles, or finger oil on the
endface, can have a significant effect on connector performance. Many times
an instrument must be serviced to replace a damaged connector when thou-
sands of dollars and lost time could have been avoided if better care were
given to the fiber-optic connector.
Figure 6-3 is a close-up micrograph of a clean cable endface. In contrast,
Figure 6-4 shows a connector endface that was either not cleaned, or not
properly cleaned. Material is smeared and ground into the endface causing
light scattering and poor reflection. Not only is the precision polish lost, but
this action can grind off the glass face and destroy the connector.
Figure 6-3. A clean and problem-free connector
book.book Page 13 Monday, January 31, 2000 10:34 AM
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