prBAS EN IEC 61755-3-1:2025

IEC 61755-3-1:2024 defines the dimensional limits of the optical interface that are necessary for single-mode fibre optic connectors with 2,5 mm or 1,25 mm diameter cylindrical zirconia (ZrO2) ferrules to meet the specific requirements for fibre-to-fibre interconnection, as defined in IEC 61755-2-1. Ferrules made from the material specified in this document are suitable for use in all the operating service environments defined in IEC 61753-1. Ferrule dimensions and features are contained in the IEC 61754 series of fibre optic connector interface standards. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) normative references have been added; b) the introduction of an additional optical interface with a different fibre core eccentricity profile. The previous revision of optical interface standard is named "Variant 1: with fibre core axis oriented towards the connector guide key". The additional optical interface is named "Variant 2: with fibre core axis not oriented towards the connector guide key"; c) statements added related to interoperability, where both variants remain intermateable within a given performance grade and backwards compatible to IEC 61755-3-1:2006; d) The addition of Grade B and Grade C interface requirements for both variants; e) The addition of a descriptive statistic for the mean fibre core eccentricity (mean value) to describe the distribution of fibre core eccentricity to ensure interoperability; f) A new informative Annex B to give guidance on the expected attenuation when mated to a reference connector plug; g) A new informative Annex C to give guidance related to the simulation of optical interface attenuation; h) A new informative Annex D to give guidance related to estimation of mean fibre eccentricity limits for finite production batch sizes.