IEC 62614-1 pdf – Fibre optics – Multimode launch conditions – Part 1: Launch condition requirements for measuring multimode attenuation 3.1 encircled fluxEF fraction of cumulative near-field power to the total output power as a function of radial distancefrom the optical centre of the core 3.2 multimode attenuation attenuation pertaining to multimode fibres andor multimode fibre components，systems andsubsystems 3.3 reference...