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DWDM
Last modified: Tuesday, March 04, 2003 

Short for Dense Wavelength Division Multiplexing, an optical technology used to increase bandwidth over existing fiber optic backbones.

DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber. In effect, one fiber is transformed into multiple virtual fibers. So, if you were to multiplex eight OC -48 signals into one fiber, you would increase the carrying capacity of that fiber from 2.5 Gb/s to 20 Gb/s. Currently, because of DWDM, single fibers have been able to transmit data at speeds up to 400Gb/s.

A key advantage to DWDM is that it's protocol- and bit-rate-independent. DWDM-based networks can transmit data in IP, ATM, SONET /SDH, and Ethernet, and handle bit rates between 100 Mb/s and 2.5 Gb/s. Therefore, DWDM-based networks can carry different types of traffic at different speeds over an optical channel.

From a QoS standpoint, DWDM-based networks create a lower cost way to quickly respond to customers' bandwidth demands and protocol changes.

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For internet.com pages about DWDM . Also check out the following links!

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DWDM Tutorial
WebProForum's DWDM tutorial is designed to familiarize you with DWDM with info and a short quiz.

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related categories

Multiplexing

Networks

related terms

bandwidth

bottleneck

demultiplex

fiber optics

multiplex


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