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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.
Coarse Wave Division Multiplexing (CWDM)
CWDM is a robust technology and is typically used for Metropolitan Area Networks or WANs for distances up to 120kms.The creation of GBIC and small form factor pluggable (SFP) transceivers utilising standardised CWDM wavelengths allows something very close to a seamless upgrade in even legacy systems that support GBIC/SFP interfaces.
Additional wavelengths/capacity can be easily added by introducing new wavelengths and this will not disturb or interrupt existing network traffic.
Optimisation of costs and improved network performance and capacity due to a flexible and future-proof CWDM system, typically mean a return of investment in a few months – operating costs on fibre leasing are reduced by 80%.
SFP/GBIC Transceivers
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