Dense Wavelength Division Multiplexing
#1

The technology of combining a number of optical wavelengths and then transmitting the same through a single fibre is called wavelength division multiplexing (WDM). Conceptually, the technology is similar to that of frequency division multiplexing (FDM) used in analogue transmission. Dense wavelength division multiplexing (DWDM) is anew born multiplexing technology in the fibre optic transmission, bringing about a revolution in the bit rate carrying capacity over a single fibre. The emergent of DWDM system is one of the important phenomena in development of optic fibre transmission. This article gives introduction of DWDM technology. The demand of bandwidth is increasing day by day, especially for data traffic. Service providers are required to provide the bandwidth dynamically and in shortest possible time. This can only be done by DWDM. In future advanced DWDM components will be available. Thus, it will be possible to manage the optical signal dynamically, which will allow more flexibility to the service providers..
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#2
Dense Wavelength Division Multiplexing

Abstract
There has always been a technological talent to fulfill the constant need to extent the capacity of communication channel and DWDM (Dense Wavelength Division Multiplexing) has dramatically brought about an explosive enlargement of the capacity of fiber network, solving the problem of increasing traffic demand most economically.DWDM is a technique that makes possible transmission of multiple discrete wavelengths carrying data rate as high as fiber plant allows over a single fiber unidirectionally or bidirectionally. It is an advanced type of WDM in which the optical channels are more closely spaced than WDM.
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#3
Dense wavelength division multiplexing


.pdf   division multiplexing.pdf (Size: 156 KB / Downloads: 4)

Definition

Dense wavelength division multiplexing (DWDM) is a fiber-optic
transmission technique that employs light wavelengths to transmit data
parallel-by-bit or serial-by-character.

Overview

The role of scalable DWDM systems in enabling service providers to
accommodate consumer demand for ever-increasing amounts of
bandwidth is important. DWDM is discussed as a crucial component of
optical networks that allows the transmission of e-mail, video,
multimedia, data, and voice—carried in Internet protocol (IP),
asynchronous transfer mode (ATM), and synchronous optical
network/synchronous digital hierarchy (SONET/SDH), respectively,
over the optical layer.

Fundamentals of DWDM Technology

The emergence of DWDM is one of the most recent and important
phenomena in the development of fiber optic transmission technology.
The functions and components of a DWDM system, including the
enabling technologies, and a description of the operation of a DWDM
system are discussed below.

Development of DWDM Technology

Early WDM began in the late 1980s using the two widely spaced
wavelengths in the 1310 nm and 1550 nm (or 850 nm and 1310 nm)
regions, sometimes called wideband WDM. Figure below shows an
example of this simple form of WDM. One of the fiber pair is used to
transmit and the other is used to receive. This is the most efficient
arrangement and the one most found in DWDM systems.

The Challenges of Today's Telecommunications
Network


To understand the importance of DWDM and optical networking, these
capabilities must be discussed in the context of the challenges faced by
the telecommunications industry, and, in particular, service providers.
Forecasts of the amount of bandwidth capacity needed for networks
were calculated on the presumption that a given individual would only
use network bandwidth six minutes of each hour. These formulas did
not factor in the amount of traffic generated by Internet access (300
percent growth per year), faxes, multiple phone lines, modems,
teleconferencing, and data and video transmission. Had these factors
been included, a far different estimate would have emerged. In fact,
today many people use the bandwidth equivalent of 180 minutes or
more each hour.
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#4
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