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DENSE WAVELENGTH
DIVISION MULTIPLEXING
Dense wavelength division multiplexing
(DWDM) is a technology that puts data from different sources
together on an optical fiber, with each signal carried at the
same time on its own separate light wavelength. Using DWDM,
up to 80 (and theoretically more) separate wavelengths or channels
of data can be multiplexed into a lightstream transmitted on
a single optical fiber. Each channel carries a time division
multiplexed (TDM) signal. In a system with each channel carrying
2.5 Gbps (billion bits per second), up to 200 billion bits can
be delivered a second by the optical fiber. DWDM is also sometimes
called wave division multiplexing (WDM).
Since each channel is demultiplexed at the end of the transmission
back into the original source, different data formats being
transmitted at different data rates can be transmitted together.
Specifically, Internet (IP) data, Synchronous Optical Network
data (SONET) web
designing company, and asynchronous transfer mode (ATM)
data can all be travelling at the same time within the optical
fiber.
DWDM promises to solve the "fiber exhaust" problem
and is expected to be the central technology in the all-optical
networks of the future.
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