IEC 62074-1 pdf download Fibre optic interconnecting devices and passive components – Fibre optic WDM devices – Part 1: Generic specification scope This part of lEC 62074 applies to fibre optic wavelength division multiplexing (WDM) devices.These have all of the following general features: They are passive, in that they contain no optoelectronic or other transducing elements; but they may use...