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Topic: Wave division multiplexing

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	Wavelength division multiplexing : Dense wave division multiplexing (Site not responding. Last check: 2007-10-21)
		In telecommunications wavelength division multiplexing (WDM) is multiplexing several optical carrier[?] n signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals.
		WDM systems are popular with telecommunications companies because they allow them to expand the capacity of their fibre networks without digging up roads again more than necessary which is extremely costly.
		Note that this term applies to an optical carrier (which is typically described by its wavelength), whereas frequency division multiplexing typically applies to a radio carrier (which is more often described by frequency).
	www.explainthis.info /de/dense-wave-division-multiplexing.html (493 words)

	Cisco: Service Provider: Optical Internetworking
		Wave division multiplexing (WDM) refers to an optical transmission technique where multiple optical signals are transmitted on a single optical fiber using diffe.rent wavelengths.
		WDM technology provides obvious benefits by increasing the capacity of existing optical fiber and thereby reducing or avoiding the need to install additional fiber.
		The economic trade-offs for the deployment of WDM are significantly different on long spans (say more than 100 kilometers) versus the shorter distances between switching equipment that are typical of metropolitan fiber networks (on the order of tens of kilometers).
	www.cisco.com /warp/public/779/servpro/solutions/optical/docs/whatiswdm.html (1331 words)

	Cisco: Service Provider: Optical Internetworking
		The term dense wave division multiplexing (DWDM) is often used to describe systems supporting a large number of channels, with "large" not clearly defined.
		Given the current cost of WDM systems and the ability to install a very large number of additional fibers with a new build, economics appear to favor installing and lighting additional fiber.
		Given the cost savings that can be provided by WDM, especially on long fiber routes, and the ability to easily add channels to an existing fiber as WDM technology advances, leasing wholesale WDM channels could become a cost-effective alternative to leasing SONET/SDH circuits.
	www.cisco.com /warp/public/779/servpro/solutions/optical/internetworking/whatiswdm.html (1373 words)

	WAVE DIVISION MULTIPLEXING (Site not responding. Last check: 2007-10-21)
		(WDM) A form of frequency division multiplexing specifically for packing many Optical Carrier n signals into a single optical fibre.
		These systems are sometimes called dense wave division multiplexing or DWDM systems.
		DWDM systems are popular with telecommunications companies because they allow them to expand the capacity of their fibre networks without digging up the road again.
	www.websters-online-dictionary.org /wa/wave+division+multiplexing.html (424 words)

	Newsbytes News Network: Microsoft Testing Wave Division Multiplexing Technology (Site not responding. Last check: 2007-10-21)
		WDM is based on a mathematical theory that dates back to 1834, although the theory has had to wait more than 160 years to be put into practice.
		Using WDM, researchers with several telecommunications hardware vendors have proven that it is possible to transmit light wave pulses across a fiber optic network for up to three times the distance thought previously possible.
		Several carriers already use WDM technology on their internal networks, both to increase the effective range of a single pulse of light without the need to reshape the pulse at a repeater, and to increase the density of the data carried on the fiber optic network.
	www.findarticles.com /p/articles/mi_m0NEW/is_n25/ai_20764106 (805 words)

	Wave-Division Multiplexing in the Sprint Long Distance Network
		Many of the factors affecting the deployment of WDM systems are discussed from the selection and installation of the fiber optic cable in the 1980s to the current bandwidth demand.
		The deployment of WDM equipment in the long distance network is largely underestimated because standards lag and carriers are reluctant to divulge details about their strategies.
		WDM systems will become a component in the optical layer of the future, however, and the network architecture will evolve at that time.
	www.comsoc.org /~ci/private/1998/feb/Butler.html (2755 words)

	WDM
		Wave division multiplexing (WDM) or Dense wavelength division multiplexing (DWDM) is a technology that puts data from different sources together on an optical fiber, with each signal carried on its own separate light wavelength
		WDM or DWDM is a new technology in multiplexing data.
		Although for now, TDM is the primary approach in today’s network, WDM is expected to be the central technology in the all-optical networks of the future.
	cops.uwf.edu /eme3402/week12/WDM.htm (200 words)

	Blinded by the wave-division light (Site not responding. Last check: 2007-10-21)
		WDM and a closely related technology, dense wave-division multiplexing (DWDM), are giving large users, telecommunications carriers and competitive service providers the opportunity to quickly increase bandwidth capacity and speeds.
		WDM switches use lasers to divide incoming data - be it from a voice, video or data device - into separate optical wavelengths, or lightstreams, across a fiber link between two switches.
		WDM and DWDM are two of the fastest ways to build an infrastructure capable of proving new bandwidth with minimum delay.
	www.nwfusion.com /news/tech/0615tech.html (868 words)

	IT Architect \| Wave Division Multiplexing \| August 1, 1999 (Site not responding. Last check: 2007-10-21)
		You can multiplex multiple signals on a single medium by assigning different frequencies to each signal (Frequency Division Multiplexing or FDM), or by assigning different time slots to each signal (Time Division Multiplexing or TDM).
		Early telephony multiplexing systems used FDM (which is also the standard multiplexing technique used for cable television), but TDM has become the dominant method used by carriers for accommodating multiple data streams on a single cable.
		Currently, WDM systems can carry as many as two dozen channels, but in the future, capacity should increase to 128 channels or more on a single fiber.
	www.networkmagazine.com /article/NMG20000727S0010 (2988 words)

	Network Magazine: Tutorials: Internetworking: Wave Division Multiplexing (Site not responding. Last check: 2007-10-21)
		TDM devices are required to convert data from light waves to electronic signals and back again—presently there are no commercially available methods for directly switching beams of light.
		WDM wavelengths can each carry independent signals—OC-3 voice on one wavelength, analog video on another wavelength, and OC-12 ATM on yet another one.
		Dense Wave Division Multiplexing steps in nicely here by lowering the cost of necessary equipment and by solving the bandwidth bottleneck that could begin plaguing the higher levels of TDM (see figure).
	webmail.cti-clonmel.ie /tutorials/networks/networkmagazinetutorial/9908tut.htm (1542 words)

	Untitled Document (Site not responding. Last check: 2007-10-21)
		Wave Division Multplexing (WDM) and Dense Wave Division Multiplexing (DWDM)
		Wave Division Multiplexing (WDM) and Dense Wave Division Multiplexing (DWDM)
		Using this analogy, both WDM and DWDM can be described as being different channels that employ different coloured beams as their carrier signals.
	www.home.gil.com.au /%7Edavidl/WDM.htm (303 words)

	Wave Division Multiplexing (WDM) Couplers
		Wave Division Multiplexing (WDM) technology allows two separate payloads (conventional 1310nm as well as 1550nm wavelength optics) to be carried over a single fiber, doubling available bandwidth.
		Traditionally, WDM Couplers have been available in basic packages - usually a metal tube with delicate fiber strands exiting each end - but easily broken strands, and a coupler body that is hard to mount have made network deployment difficult.
		Most importantly, our WDM Couplers are designed to work “hand-in-glove” with all O3D3, O3-3D3 and O3-3D3P transport modules, each with Wideband Optical Receivers capable of receiving 1310nm or 1550nm wavelengths.
	www.agtprint.com /s79/htmfiles/wdm.html (373 words)

	WDM, DWDM,CWDM Wave Division Multiplexing, Course Wave Division Multiplexing
		Multiplexing is the process of combining several data streams operating at unique wavelengths on several fibers onto a single fiber "trunk".
		An Add/Drop Multiplexer takes a single wavelength from a trunk, pulls the signal out, and allows a new signal at the same wavelength to be inserted into the trunk at (roughly) the same spot.
		Sub-rate Multiplexing is the process of placing several data streams onto a single wavelength, in an effort to further increase the number of data streams in a WDM system.
	www.atekcommunications.com /wdm.htm (1069 words)

	[Report] Wave Division Multiplexing, Photonic Switching and the Coming of All Optical Networks 1999-2000, Volume 1, ...
		In early 1998, CIR brought to market the first in a series of reports that would address the future of Wave Division Multiplexing, Optical Networking, Photonic Switching, Optical Components and SONET/SDH.
		Purchasers of this report were able to distinguish between the hype and the reality concerning all-optical networks and learned where the applications for this exciting technology were likely to emerge in the next few years and what the size of the marketing opportunities would be.
		CIR is pleased to announce that its 1999 version of "Wave Division Multiplexing, Photonic Switching and the Coming of All Optical Networks" will soon be become available to interested companies.
	www.gii.co.jp /english/ci4487_mn_wdm.html (373 words)

	Commercial Telecommunications Standards - About WDM (Site not responding. Last check: 2007-10-21)
		Wavelength Division Multiplexing is a relatively new technology that enables significant increases in the data rates that can be carried over a single fiber by the use of multiple wavelengths, each carrying a separate "channel".
		TDM techniques that have been used in the past have their limitations since the wider bandwidth required around a single base wavelength (color) leads to impairments that limit the distance achieved.
		Static optical add-drop multiplexers (OADM) allow a small number of contiguous wavelengths to be added and dropped at a point without the need to demultiplex the entire group.
	comm.disa.mil /on/abt_wdm.html (523 words)

	Dense Wave-Division Multiplexing for Broadband Application
		The OptiMux 650 Series is a fiber optic, protocol independent multiplexer that is designed to multiplex Singlemode and Multimode digital optical signals.
		Using automatic gain control and state-of-the-art multiplexing technology, the OptiMux 650 is a plug and play device.
		The OptiMux650 multiplexes SONET OC-1, OC-3, and OC-12, SDH STM-1 and STM-4, 10M Ethernet, 100M Ethernet, DS3, E3, CEPT-1, FDDI, ESCON, and many other standard or proprietary digital optical signals.
	www.multidyne.com /dwdm.html (730 words)

	Motorola Voice and Data Solutions - Wave Division Multiplex (WDM) (Site not responding. Last check: 2007-10-21)
		Wave Division Multiplexing (WDM) allows network operators to more efficiently utilize bandwidth by aggregating separate wavelengths or channels onto a single optical fiber.
		While Dense Wave Division Multiplexing (DWDM) is preferred for applications with longer fiber spans and higher bandwidth requirements, Course Wave Division Multiplexing (CWDM) is often a lower-cost alternative to DWDM, particularly for short-haul and low channel-count applications.
		This traffic is fed onto an MWT and channels are multiplexed onto a single wavelength for transport across the network.
	broadband.motorola.com /ips/wave_div_multi.html (1739 words)

	Optical Networking Home Page (Site not responding. Last check: 2007-10-21)
		Our purpose is to open up as much of the full potential as we can of all the optical fiber being installed worldwide, currently underused by a factor of ten thousand in bandwidth.
		Typical time-division multiplexed systems are limited in their exploitation of this bandwidth for communication by electronic speeds, which currently allow transmission at bit trates of up to a few Gb/s total.
		WDM systems get around this limitation by using multiple frequency or wavelength channels in this bandwidth.
	www.research.ibm.com /wdm (177 words)

	Wave Division Multiplexing Kit (Site not responding. Last check: 2007-10-21)
		Viva Photonic’s Wave Division Multiplexing Kit enables educators to introduce key aspects of communication by light to secondary students in science and technology from Years 7 - 12.
		The use of WDM is a very important part of optical communications, whereby multiple signals are transmitted through one optical channel.
		When different data signals are transmitted on each WDM colour, the use of a filter allows the individual sounds to be selected from the jumbled output.
	www.pascoaustralia.com /education/viva/wdm.lasso (687 words)

	Wave Division Multiplexing Moves into the Metro Mainstream - Market Research Report (Site not responding. Last check: 2007-10-21)
		Wave Division Multiplexing (WDM), used in long-haul networks since 1995, is moving into the metropolitan-area network market.
		To leverage the full market potential of WDM, the technology must move from a pure transport vehicle to a platform that offers new revenue-generating services.
		Service providers require a means of integrating the new technologies, and providing new packet-based services, with their existing networks without a forklift change.
	www.telecom-research.com /R388-0145.html (467 words)

	What is DWDM? - A Word Definition From the Webopedia Computer Dictionary
		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.
		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.
	www.webopedia.com /TERM/D/DWDM.html (375 words)

	Search Results for dense wavelength division multiplexing (DWDM) time wave division multiplexing DWDM MICROPOWER ...
		Dense wavelength division multiplexing (DWDM) is a technology that puts data from different sources together on an optical fiber, with each signal carried on its own separate light wavelength.
		These add-drop multiplexers offer a high-speed switching function that could not be duplicated with electronics, and have made metropolitan-area networks into a unique flexible, high-throughput communications medium.
		The battle of the air waves is just not between cable modems (which don't work very well) and DSL which has many problems and is priced too high.
	www.wiredbrain.com /techsearch.htm (5868 words)

	Wave Division Multiplexing: Wave Division Multiplexing
		Wavelength Division Multiplexing (WDM) is a method of transmitting data from different sources over the same fiber optic link at the same time whereby each data channel is carried on its own unique wavelength.
		The result is a link with an aggregate bandwidth that increases with the number of wavelengths employed.
		In this way WDM technology can maximize the use of the fiber optic infrastructure that is available; what would normally require two or more fiber links instead requires only one.
	www.mrv.com /wdm (89 words)

	EETimes.com
		ATLANTA — Booming interest in wavelength division multiplexing among broadband backbone equipment suppliers is exemplified by the number of WDM announcements at both the National Cable Television Association's Cable '98 convention in Atlanta, and at the NetWorld+Interop show being held in Las Vegas.
		While a WDM theme had long been anticipated at N+I, the NCTA show surprised observers with several announcements and sessions Sunday and Monday on using dense WDM in cable systems.
		A special Monday WDM session was slated to hear presentations on new systems from Antec Corp. (Norcross, Ga.), working on an analog WDM system; and ADC Broadband Communications Inc. (Meridien, Conn.), which is experimenting with dense WDM in both analog and digital environments.
	www.eetimes.com /news/98/1006news/cable.html (707 words)

	Wave Division Multiplexing (Site not responding. Last check: 2007-10-21)
		Assigns each optical signal to a specific bandwidth and then transmits them all via the fiber
		Current standards permit 8 channels to be multiplexed
		Allows 128 channels to be multiplexed, providing an aggregate bandwidth of up to 1.28 Tbps
	asgard.kent.edu /collabwork/wireline/sld023.htm (47 words)

	Dense Wave Division Multiplexing (DWDM) for NCAR's BRAN fiber
		If we use a Wave-Division Multiplexer (WDM), however, then your worries are over.
		In addition to amplifying the signal, the WDM also provides an alarm and an instant reroute if the fiber breaks.
		The NETS is part of the Scientific Computing Division of the National Center for Atmospheric Research, which is part of the University Corporation for Atmospheric Research.
	www.scd.ucar.edu /nets/intro/staff/colburn/DWDM.html (760 words)

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