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Publication: Light Reading
Date: 15th November 2002
Title: Poll Paints Bright Future for CWDM
Coarse
wavelength-division multiplexing (CWDM) could eventually overtake DWDM
in metro markets, according to a Light Reading Research Poll on the subject
staged in October.
A total of 249 people took the poll, and -- surprisingly -- 43 percent
of them went so far as to say that CWDM would overtake DWDM in metro markets.
Another 35 percent said CWDM would be widely deployed, but not as widely
deployed as DWDM.
The
full results of the poll can be seen here.
Until
recently, CWDM was considered something of a poor cousin to DWDM - partly
because it could pump only up to eight channels down a pair of fibers,
and partly because it wouldn't work over distances of more than about
50 kilometers.
Now
sentiment appears to have changed, mainly because CWDM promises to help
carriers out of a jam by boosting bandwidths in metro networks without
busting the bank.
Opinions
vary over how much carriers can actually save with the technology. Some
CWDM equipment vendors say they can cut costs by a factor of three, while
DWDM vendors say savings rarely exceed 20 percent. In the Light Reading
poll, 30 percent of respondents thought CWDM could deliver savings of
more than 50 percent compared to DWDM. Only 25 percent of respondents
thought savings would be 20 percent or less.
Confidence
in CWDM as a technology appears to have grown since a 16-channel version
was standardized by the International Telecommunication Union, Standardization
Sector (ITU-T) last June. In the Light Reading poll, 82 percent of respondents
said CWDM was mature enough to be used in metro networks; only 11 percent
thought it wasn't.
The other reason for CWDM's increasing popularity is probably the growing
availability of low water peak fiber, required for 16-channel systems,
and the arrival of innovative CWDM solutions from the likes of Cisco Systems
Inc. and Transmode Systems AB.
- Peter Heywood, Founding Editor, Light Reading
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