Topics: Wavelength-division multiplexing, Optical fiber, Multiplexing Pages: 8 (2457 words) Published: August 22, 2013
Swapnil Salunkhe
R.C.Patel Institute Of Technology


The race for unprecedented bandwidth is on - and DWDM(Dense Wave-length Division Multiplexing) is opening the way. DWDM is the technology that allows multiple streams of data to flow in one optical fiber of optical communication network. DWDM is the key technology at the heart of new systems and networks that offers more bandwidth at less cost. Soon, DWDM promises to change bandwidth from a premium to a commodity item. DWDM: Networks, Devices, and Technology provides a comprehensive treatment of DWDM, its technology, systems, and networks, as well as engineering design.Over the last decade, fiber optic cables have been installed by carriers as the backbone of their interoffice networks, becoming the mainstay of the telecommuni-cations infrastructure. Using time division multiplexing (TDM) technology, carriers now routinely transmit information at 2.4 Gb/s on a single fiber, with some deploying equipment that quadruples that rate to 10 Gb/s. The revolution in high bandwidth applications and the explosive growth of the Internet, however, have created capacity demands that exceed traditional TDM limits. As a result, the once seemingly inexhaustible bandwidth promised by the deployment of optical fiber in the 1980s is being exhausted. To meet growing demands for bandwidth, a technology called Dense Wavelength Division Multiplexing (DWDM) has been developed that multiplies the capacity of a single fiber. DWDM systems being deployed today can increase a single fiber’s capacitysixteen fold, to a throughput of 40 Gb/s! This cutting edge technology—when combined with network management systems and add-drop multiplexers enables carriers to adopt optically-based transmission networks that will meet the next generation of band- width demand at a significantly lower cost than installing new fiber.

1.The Challenges In Today’s optical networks.
2. WDM System.
4.Components of DWDM
5.Why DWDM?

1.The Challenges In Today’s optical networks
To understand the importance of DWDM, These capabilities must be discussed in the context of the challeges faced by telecommunication industry,and in particular,service provider.Most networks were built using estimates that calculated bandwidth capacity use by emplying ratios derived from classical engineering formulas. This factor did not factor in the amount of traffic genrated by the internet acess(300 percent per year).Had thse factors been included, a far diffrent estimates would have emerged. Therfore, an enormous amount of bandwidth capacity is required to provide the services demanded by consumer.In addtion to this explosion in consumer demand for bandwidth, many service providers are coping with fibre exhaust in their networks. An industry survey indicateed tha in 1995, the amount of embedded fibre already in use in the average network was between 70 percent to 80 percent. Today many carrier are nearing hundred percent capacity utilization across significant portion of their network .Another problem for carriers is the deploying and integrating diverse technologies in one physical infrastructure. customer demands and competitive pressure mandate that carriers offers diverse services economically and deploy them over the embedded network . DWDM provides service proviser a answer to that demand(see figure 1).

2.WDM systems
To understand the concepts of DWDM systems ,first we must understand WDM System. A WDM system uses a multiplexer at the transmitter to join the signals together, and a...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Dwdm
  • Essay about Dwdm
  • Cwdm vs Dwdm Research Paper

Become a StudyMode Member

Sign Up - It's Free