What is the most critical step to perform when you are using optical fiber connectors?

Question

Options

• ACover with dust caps when not in use.
• BImmerse in alcohol prior to use.
• CBlow off and carefully wipe down with a tissue before and after each use.
• DLightly sand with cloth prior to mating.

• A
  96% (22)
• B
  4% (1)

Explanation

Covering fiber optic connectors with dust caps when not in use is the most critical protective measure because even microscopic dust particles on the polished end face can cause significant signal loss, back-reflection, or permanent physical damage to the ferrule - contamination is the leading cause of fiber connection failures.

Why the distractors are wrong:

• B (immerse in alcohol): Immersing connectors can leave residue and damage the ferrule or housing; proper cleaning uses lint-free wipes moistened with isopropyl alcohol, not full immersion.
• C (blow off and wipe with tissue): While inspection and cleaning before mating is good practice, ordinary facial tissues are too abrasive and can scratch the polished fiber end face - only lint-free, fiber-specific wipes should be used, and "blowing" can introduce moisture.
• D (lightly sand with cloth): Sanding destroys the precision-polished end face of the connector, making it unusable; fiber ends require factory or field polishing, not abrasive treatment.

Memory tip: Think of dust caps like lens caps on a camera - you would never leave an expensive camera lens uncapped and exposed. "Cap it to protect it" keeps contamination, the #1 fiber enemy, away from the polished end face.

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