Dense wavelength division multiplexing (DWDM) is a technology to multiplex/combine many discrete channels into a signal and transmits one or more such signals on single optical fiber. Hence one Fiber works as multiple virtual fibers. The capacity of DWDM is many times as compared to SDH system.

Wavelength division multiplexing types


It is the most basic form. It can support 2, 4, 8 or 16 channels.


It’s an acronym of coarse wavelength division multiplexing. It can support 18 channels of 3000GHz (20nm).


It can support max 128 channels with varying channel spacing from 25, 50, 100 or 200GHz.

Dense Wavelength division multiplexing System elements


It converts electrical bits to the optical signal with the help of narrowband laser pulse.

                Optical multiplexer

It combines the discrete wavelengths channels.

                Optical Demultiplexer

It separates the discrete wavelengths channels.

                Optical Amplifier

It amplifies the signal strengths. These are of three types Pre-Amplifier, Post-Amplifier and In-line Amplifier.

                Optical Fiber

It carries the optical signals of different wavelengths. It is also known as media for transmission.


It converts optical signal to electrical bits with the help of wideband laser pulse

Read it Also: BSNL Optic Fiber Router Configuration

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Advantages of Dense wavelength division multiplexing

Very High capacity or bandwidth

Doesn’t require the replacement of existing infrastructure

Bit rate independent means different speed streams can be transmitted simultaneously.

It is a protocol independent, or we can say that it can carry the different type of data like IP, Ethernet, ATM.

It can meet the growing demand of data or broadband services.

See also FTTH Broadband, DSL Broadband,

Wired Internet Service Providers,

Dense wavelength division multiplexing

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