IEC 62074-1:2025 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 can use temperature control only to stabilize the device characteristics; they exclude any optical switching functions;
• they have three or more ports for either the entry or exit of optical power, or both, 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 document establishes uniform requirements for the following:
• optical, mechanical and environmental properties.

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