DIN EN IEC 61755-3-1:2024-12

This part of IEC 61755 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. There are no restrictions on the scope of application of the document. The standard differs from DIN EN 61755-3-1:2009-08 as follows: 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. The standard increases investment security for manufacturers and users, provides test laboratories and manufacturers with defined test specifications, and ensures compatibility across manufacturers.