wavelength division multiplexing - Definition. Was ist wavelength division multiplexing
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Was (wer) ist wavelength division multiplexing - definition

TECHNOLOGY WHICH MULTIPLEXES A NUMBER OF OPTICAL CARRIER SIGNALS ONTO A SINGLE OPTICAL FIBER BY USING DIFFERENT WAVELENGTHS
DWDM; Dense wave division multiplexing; Wavelength Division Multiplexing; Wave division multiplexing; Wavelength-division multiplexed; Coarse wavelength division multiplexing; CWDM; Dense WDM; Coarse WDM; Dense wavelength division multiplexing; Wave-division multiplexing; Wavelength Division Multiplex; Wavelength division multiplex; Dense wave-division multiplexing; Wavelength division multiplexing; Dense wavelength-division multiplexing; Wavelength-division multiple access; Wavelength Division Multiple Access; Wavelength Division Multiplexors; Dense Wavelength Division Multiplexing; Wavelength division multiple access; Shortwave Wavelength Division Multiplexing; Coarse wavelength-division multiplexing; Wavelength-division duplexing
  • WDM System in rack 19/21<nowiki>''</nowiki>
  • Series of SFP+ transceivers for 10 Gbit/s WDM communications
  • WDM multiplexer for DWDM communications

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}. [Is "wave division multiplexing", as in "dense wave division multiplexing" (DWDM) just a trendy abbreviation?] (2002-07-16)
Wavelength-division multiplexing         
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e.
wave division multiplexing         
<spelling> A common misnomer for {wavelength division multiplexing}. (2002-07-16)

Wikipedia

Wavelength-division multiplexing

In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over a single strand of fiber, also called wavelength-division duplexing, as well as multiplication of capacity.

The term WDM is commonly applied 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. This is purely conventional because wavelength and frequency communicate the same information. Specifically, frequency (in Hertz, which is cycles per second) multiplied by wavelength (the physical length of one cycle) equals the velocity of the carrier wave. In a vacuum, this is the speed of light, usually denoted by the lowercase letter, c. In glass fiber, it is substantially slower, usually about 0.7 times c. The data rate in practical systems is a fraction of the carrier frequency.