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
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
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
See also time division multiplexing, code division multiplexing.
[Is "wave division multiplexing", as in "dense wave division multiplexing"
(DWDM) just a trendy abbreviation?]
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