IEC 61280-1-4:2009 Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method
2009IEC 61280-1-4:2009 Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method
2003IEC 61280-1-4:2003 Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems; Collection and reduction of two-dimensional nearfield data for multimode fibre laser transmitters