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.
IEC 61755-2-1:2006 history
2022IEC 61755-2-1:2022 Fibre optic interconnecting devices and passive components - Connector optical interfaces for single-mode fibres - Part 2-1: Connection parameters of dispersion unshifted physically contacting fibres
2006IEC 61755-2-1:2006 Fibre optic connector optical interfaces - Part 2-1: Optical interface standard single mode non-angled physically contacting fibres