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.

References in periodicals archive ?
Thus, rising demand for bandwidth for data transmission has driven the growth of networks based on dense wavelength division multiplexing (DWDM) and Ethernet technologies, notes the analyst of this research service.
Worldwide Dense Wavelength Division Multiplexing (DWDM) Equipment Market Forecasts
Harmonic's new digital return solution, which uses both time division multiplexing (TDM) and wavelength division multiplexing (WDM) technologies, enables operators to efficiently expand upstream capacity from the home while leveraging the established HFC infrastructure to the fullest possible extent and minimizing the need for costly fiber construction.
As the first solution in NEC's new-generation optical networking platform, the NEC 4240 helps network operators overcome the design limitations of conventional metro dense wavelength division multiplexing (DWDM) systems.
a leading supplier of IT and wireline/wireless networking solutions, announced today that Dell'Oro Group has named Fujitsu a top vendor in worldwide metro Dense Wavelength Division Multiplexing (DWDM) equipment with an 18.
This flexible, cost-effective solution is designed for all passive components, but due to its extended wavelength range of nearly 400 nm, it is particularly well suited for fiber-to-the-x (FTTx) and coarse wavelength division multiplexing (CWDM) applications.

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