A so-called WDM is a wavelength-selective coupler. The optical frequency multiplexing method, wavelength division multiplexing (WDM), splits the wavelengths in such a way that each spectral color has its own transmission channel.
Available for singlemode and multimode applications
The CWDM, based on the new ITU grid from 1271 nm to 1611 nm, are available for multi-mode and single mode applications. They are used, for example, in video surveillance or high speed data transmission.
DWDMs are available in channel numbers of up to 40 and at a channel separation of 100 GHz or 200 GHz according to the ITU-T grid. They are primarily used in the field of telecommunications.