Storage Smarts Answer #30

Storage Smarts Answer #30

Were you correct? This week's answer is:
b. dense wavelength division multiplexing (DWDM)

Learn more:

Dense wavelength division multiplexing 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), 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.

For more information:

DWDM for long-distance SANs

Considerations for SAN extension

Trouble with linking across a DWDM

Ask Mark Farley your storage networking questions.

Talk with your peers in the .8H7Qa4aJmqg.0@.ee83ce4!viewtype=&skip=&expand=>Storage Networking discussion forum.

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This was first published in September 2002

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