61755-2-1-2006 Fibre optic connector optical interfaces – Part 2-1: Optical interface standard single mode non-angled physically contacting fibres (Edition 1.0)
Interfaces optiques de connecteurs pour fibres optiques – Partie 2-1: Interfaces optiques pour fibres unimodales en contact physique sans angles (Edition 1.0)
This part of IEC 61755 defines a set of prescribed conditions that must be maintained in order to satisfy the requirements of attenuation and return loss performance in a randomly mated pair of fibres considering a beam with a Gaussian distribution of light intensity over the considered MFD. Performance grades are classified into four categories for attenuation and return loss measurements.?