UNE-EN IEC 61300-3-35:2022

This part of the IEC 61300 series is concerned with the observation and classification of debris

(removeable particles on the surface of a fibre/ferrule), scratches and defects (non-removeable features

on the surface of a fibre/ferrule). The inspection requirements are based on IEC TR 62627-05. Advice

for cleaning of contamination from fibres/ferrule is found in IEC TR 62627-01 and a recommendation is

given in Annex E. Visual inspection is in addition to, and does not replace measurement of performance

parameters such as attenuation and return loss, or end face parameters. The dimensions specified are

chosen such that they can be easily estimated. Not only the zones A and B on the fibre are to be

inspected for defects and scratches but the whole contact area (where the two fibres/ ferrules meet

when mated) needs to be inspected for contamination (This is up to 250 µm diameter for cylindrical

ferrules and the whole ferrule surface for rectangular ferrules).

The objectives of this standard are to:

specify the minimum criteria a microscope is to meet to be compliant to this standard;

specify the procedure and criteria for inspecting fibre-optic end faces for cleanliness to determine if

the end faces are fit for use. All connector optical interfaces (IEC 61755 series and IEC 63267

series) are based on physical contact between fibre cores;

provide quantitative criteria for the analysis of end face images.