Wave Division Multiplexing (WDM)

Wavelength-division multiplexing (WDM) technology allows multiple optical signals to be carried on a single optical fibre by using different wavelengths of laser light.

Essentially, it allows an expansion of the capacity of your network without laying more fibre and without having to overhaul the backbone network.

WDM systems are divided into different wavelength patterns – Coarse WDM (CWDM) and Dense WDM (DWDM).

Dense Wave Division Multiplexing (DWDM)

DWDM uses cooled laser technology and can be amplified allowing the transmission distances to be extended.

Since DWDM provides greater maximum capacity and tends to be used at a higher level in the communications hierarchy than CWDM.