Made by:Nalin DubeyB.Tech (ECE)

130020204016

WDM (Wavelength Division Multiplexing)

DefinitionIn fiber-optic communications, wavelength division

multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light.

A WDM system uses a multiplexer at the transmitter to join the several signals together, and a demultiplexer at the receiver to split them apart. With the right type of fiber it is possible to have a device that does both simultaneously, and can function as an optical add-drop multiplexer.

WDM operating principle

Types of WDMCWDM(Coarse Wavelength Division

Multiplexing)DWDM(Dense Wavelength Division Multiplexing)

DWDMMore channels closely spaced together than WDM.These help in creation of low cost way to quickly respond the

customer bandwidth demands and protocol changes.

CWDMNumber of channel is fewer than in DWDM but

more than in standard WDM.Done by laser emission.

AdvantagesAllows multiple connection over one fiber thus

reducing fiber plant requirement.This can provide fiber redundancy.This provides a managed fiber service.Smooth ExpansionLong Haul transmissionData Transparency

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