(Course WDM) An optical transmission method that is used for shorter distances than dense WDM (DWDM). Also known as "wide WDM," CWDM transmits fewer channels and uses wider spacing between the channels for distances up to 60 km. Wider spacing up to 25 nm, compared to 1.6nm and smaller for DWDM, tolerates more temperature fluctuation.
Standardized by the IEEE in 2004 for 10 Gigabit Ethernet, CWDM components are much less costly than DWDM because the laser does not have to be stabilized, and an external modulator is not required. The laser can be modulated directly by changing the drive current. CWDM operates between 1265 and 1625 nm compared to DWDM's tighter 1530-1620 range. See WDM.
Standardized by the IEEE in 2004 for 10 Gigabit Ethernet, CWDM components are much less costly than DWDM because the laser does not have to be stabilized, and an external modulator is not required. The laser can be modulated directly by changing the drive current. CWDM operates between 1265 and 1625 nm compared to DWDM's tighter 1530-1620 range. See WDM.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- How Cisco IT Used CWDM to Interconnect Japanese Data Center Sites
- Although a dedicated data center appeared to be a good solution, the cost of providing reliable connectivity between the data center and the two sales offices seemed prohibitive. To provide an acceptable level of reliability and redundancy, a circuit would be needed from the data center to Akasaka, from Akasaka...
- Case studies 2007-12-17
- Deploying CWDM to Overcome Bandwidth Limitations of FTTH Access Networks
- FTTH networks in North America are being built using various PON architectures fed from a common backhaul. As networks grow in terms of geographic reach, subscriber counts and the scope and number of services offered, Coarse Wave Division Multiplexing CWDM has clearly become the preferred method for increasing the bandwidth...
- White papers 2006-08-30
- Cisco Uses Dark Fiber and CWDM Technology for Lower Cost and Increased Network Availability
- Cisco Systems maintains two sales offices in Tokyo, Japan. Although a dedicated data center appeared to be a good solution, the cost of providing reliable connectivity between the data center and the two sales offices seemed prohibitive. In 2003, with the construction of a dedicated data center under serious consideration,...
- Case studies
- Hays Consolidated Independent School District Tackles Rapid Growth With a Converged Network Solution
- The Hays Consolidated Independent School District in Texas serves 9,703 students and employs more than 1,300 faculty and staff in an area along the Austin-San Antonio corridor. This district's phenomenal growth rate - where student population is predicted to possibly double by 2010 - necessitated a network solution that will...
- Case studies
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