This part of IEC 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;
however they may use temperature control only to stabilize the device characteristics;
they exclude any optical switching functions;
they have three or more ports for the entry and/or exit of optical power, and share optical
power among these ports in a predetermined fashion depending on the wavelength;
the ports are optical fibres, or optical fibre connectors.
This standard establishes uniform requirements for the following:
optical, mechanical and environmental properties.