dwdm

•A Dense wavelength division multiplexed (DWDM) system can be viewed as a parallel set of optical channels,each using a slightly different wavelength,but all sharing a single transmission medium.

DWDM Functions

•Why DWDM

-To increase the Transport capacity of the network

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•What it does

-Transports more than one/multiple optical channels over a single optical fibre cable

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-Transmits simultaneously multiple carriers of different wave lengths over a single fibre

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- Enables transmission of data from different sources simultaneously at same time with different carrier wave lengths

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DWDM is used to:

•Provide cost effective migration from low capacity network to high capacity networks

•Offers flexibility,versatility, multi service platform, bit rate protocol independent,less expensive compared to SONET or SDH.

•Open doors to Ethernet systems like SAN(Storage area network),NAS(Network attached storage)

•Ideal for Metro networks as it can carry Ethernet on one wave length,SDH on another,HDTV(High definition TV) on another wave length

•Up to 80 separate wave lengths/channels of data can be transported

•Fibre carrying 2.5 Gbps(STM 16) can be made to carry 200 billion bits

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