A repeatable inspect-clean-inspect workflow based on objective criteria rather than visual guesswork.
A connector can look clean to the unaided eye and still fail an objective end-face inspection. Debris or defects near the fibre core can increase loss and reflection, contaminate the mating connector or damage the contact surface.
Why this matters
IEC 61300-3-35:2022 specifies procedures and quantitative criteria for visual inspection of fibre-optic connector end faces. It covers the classification of debris, scratches and defects and extends cleanliness inspection across the contact area.
The standard also makes an important distinction: visual inspection complements rather than replaces measurements such as attenuation and return loss.
Controls that should be defined
- Use inspection equipment suitable for the connector and criteria.
- Assess the required fibre zones and contact area consistently.
- Clean with an approved method when contamination is present.
- Inspect again before mating; never assume cleaning succeeded.
- Combine visual evidence with optical performance testing where required.
A practical workflow
- Inspect before the first mating and whenever a connection is reopened.
- Classify the image against the applicable acceptance criteria.
- Clean only with suitable materials and technique.
- Reinspect and repeat only as permitted by the procedure.
- Record evidence for critical, disputed or repeatedly failing links.
Evidence to retain
Retain connector identity, inspection image, date, operator, cleaning action, result and associated optical test measurements when the link is acceptance-critical.
Conclusion
Inspect, clean and verify before mating. A repeatable process reduces troubleshooting time, protects mating surfaces and replaces subjective judgement with evidence.
