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Technology Stocks : Optical Networks and Components, DWDM and Tunable Lasers

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To: songw who wrote ()2/17/2000 9:34:00 AM
From: Dr. Peter E. Pflaum  Read Replies (1) of 275
 
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High Speed Internet by Soliton

DWDM (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 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. 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, SONET data, and 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. DWDM replaces time-division
multiplexing (TDM) as the most effective optical transmission method. Although TDM
is the primary approach in today's networks, DWDM systems are expected to be tested
and deployed in late 1998 and 1999.

Selected Links

Web ProForum hosts a tutorial on DWDM from Lucent Technologies. Lucent
Technologies offers its WaveStar OLS 400G, a system that provides up to 400 Gbps
over a single fiber and, in its maximum eight-fiber configuration, can transmit 3.2
trillion bits per second.

-------------------------------------------------------------------------------- This term was suggested
by Herschel Salan. Last update: October 12, 1999 Copyright ¸ 1996-99 by whatis.com
Inc. All rights reserved.

Shanghai Bell Chooses ANTEC`s Optronics For Deployment of
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Alcatel and the MPT Design Institute of China, will deploy its Laser Link(R) optical
transmitters
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