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Wave Division Multiplexing (WDM)

- WDM is analog multiplexing technique.
- It's working is same as  FM.
- In WDM different signals are from optical fibers.
- Various light waves from different source combined to form a composite light signal that is transmitted across the channel to receive.
- At the receive side the composite signal light signed is broken into different light waves by demultiplexing.
- This combining and splitting of light wave is done by using prism.