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Wavelength Division Multiplexing
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                    Optical communication uses a special kind of multiplexing which is known as Wavelength division multiplexing or simply WDM. It is a type of multiplexing where light signals from multiple sources operating at slightly different wavelengths are multiplexed to transmit several information streams simultaneously over the same fiber.

                   WDM offers a further boost in fiber transmission capacity. Following figure shows how WDM is incorporated in an optical communication system.

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