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Why It Is Necessary to Clean the Optical Interface
The optical connectors and optical plugs are the only optical components whose optical
fiber end faces are exposed to the outside. Even a tiny scratch on their end faces that
cannot be detected by the naked eye greatly affects their optical performance. If optical
connectors are connected improperly, if they are connected without the removal of
dust or dirt, or if they are cleaned improperly, the optical connector end faces may be
damaged.
When connecting optical connectors, you must properly align the ferrule cores of both
optical connectors. An optical adapter is used for this connection, but if the connection
is made with dirt or dust attached to the ferrule side face or ferrule guide (sleeve) of the
optical adapter, the cores cannot be properly aligned. This may lead to problems such as
optical power loss, transmission mode disturbances, and an increased optical reflection
at the connection point. Consequently, the instrument will not be able to take proper
measurements.
To prevent problems such as these, it is necessary to keep the optical connectors clean
and to make proper connections when connecting optical connectors to measuring
instruments or to other optical connectors.
When you use this instrument, clean the ferrule every time it is connected and clean the
precision sleeve at least once every thirty connections. In particular, if you use optical
connectors such as those described on the following page, we recommend that you
clean them before every use.
• Optical connectors are connected after a metallic sleeve has been inserted
→ Particles that are worn off of the metallic sleeve may stick to the ferrule side face or
end face particularly easily.
• Optical connectors that have ferrule materials that easily wear out, such as metallic or
crystallized glass ferrule
→ Ferrule particles may wear off easily from connecting and disconnecting the optical
connector.
• Optical connectors and precision sleeves, with which plastic shell type optical
connectors are repeatedly engaged
→ Plastic particles wear off easily from the repeated engagement of the shell.
Enlarged photo of a good optical
connector connection
Enlarged photo of a scratched optical
connector connection
4.5 Routine Maintenance
4-28
IM 735101-01EN