wavelength division multiplexing


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Related to wavelength division multiplexing: Dense wavelength division multiplexing

wavelength division multiplexing

(communications)
(WDM) Multiplexing several Optical Carrier n signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals.

The device that joins the signals together is known as a multiplexor, and the one that splits them apart is a demultiplexor. With the right type of fibre you can have a device that does both and that ought to be called a "mudem" but isn't.

The first WDM systems combined two signals and appeared around 1985. Modern systems can handle up to 128 signals and can expand a basic 9.6 Gbps fibre system to a capacity of over 1000 Gbps.

WDM systems are popular with telecommunications companies because they allow them to expand the capacity of their fibre networks without digging up the road again. All they have to do is to upgrade the (de)multiplexors at each end. However these systems are expensive and complicated to run. There is currently no standard, which makes it awkward to integrate with older but more standard SONET systems.

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). However, since wavelength and frequency are inversely proportional, and since radio and light are both forms of electromagnetic radiation, the distinction is somewhat arbitrary.

See also time division multiplexing, code division multiplexing.

WDM

(1) (Wavelength Division Multiplexing) A communications technology that transmits several wavelengths of light (lambdas) simultaneously over a single optical fiber. Using multiple lasers, each signal travels within its unique color band modulated by the data.

WDM has dramatically increased the carrying capacity of the fiber infrastructure of the telephone companies and other carriers. Also known as "dense WDM" (DWDM), vendors have introduced systems that can support hundreds of wavelengths, each carrying 10 Gbps. That means terabits of data per second can travel over one optical strand, thinner than a human hair. Contrast with TDM. See CWDM and fiber optics glossary. See also FDM.

(2) (Win32 Driver Model) A device driver architecture from Microsoft that consolidates drivers for Windows 95/98 and subsequent versions of Windows. WDM allows a hardware vendor to write one driver for its peripheral device that works with all 32-bit versions of Windows. See driver.
References in periodicals archive ?
DWDM, or dense wavelength division multiplexing, is a type of technology that boosts the capacity of optical fibre.
The CWDM8 MSA (8-wavelength Coarse Wavelength Division Multiplexing Multi-Source Agreement) Group has announced its formation as an industry consortium dedicated to defining optical specifications and promoting adoption of interoperable 2 km and 10 km 400 Gb/s interfaces over duplex single-mode fiber, the company said.
This deployment, financial details of which were not available, is Paratus' first offering of wavelength division multiplexing (WDM) networking for connectivity services in Windhoek, Namibia's capital city.
The FSP 3000 is a scalable Wavelength Division Multiplexing (WDM) system designed for communications providers and large enterprises that require a flexible system that will multiplex, transport and protect high-speed data, storage, voice and video applications.
Wavelength division multiplexing (WDM) places each data channel on a different wavelength (frequency) of light, making it possible to send many channels of data over the same fiber.
Mitsubishi Electric announced the development what it claims to be the first worldwide compact and pluggable 10 Gbps optical communications transceiver (MF-10KWXF series) capable of optional tuning of DWDM (Dense Wavelength Division Multiplexing) in the entire C-band.
Swedish telecomms solutions provider Ericsson said on Friday (22 September) that it had been selected to provide its DWDM (Dense Wavelength Division Multiplexing) optical technology for the upgrade of T-Com's metro and regional networks in Germany.
As the FLASHWAVE 6400 aggregation switch, the role of the Hammerhead platform will be expanded to allow tighter coupling with existing Fujitsu FLASHWAVE SONET and Dense Wavelength Division Multiplexing (DWDM) products.
Suitable for access and metropolitan network architectures using coarse wavelength division multiplexing.--Alcatel
The test, named the ''Terabit Challenge,'' employs a dense wavelength division multiplexing (DWDM) system capable of moving 10 gigabits (billion bits) of data through 176 channels per second -- or 1.76 terabits per second -- which is four times the current capacity.
Siemens Munich, Germany-based Advanced Optical Networks Laboratory has demonstrated the transmission of data over a single fibre-optic at a speed of 7.04 Tbps using Dense Wavelength Division Multiplexing (DWDM) technology.

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