Coarse Wavelength Division Multiplexing (CWDM)
Definition - What does Coarse Wavelength Division Multiplexing (CWDM) mean?
CWDM transmits few channels and makes use of wider spacing in between the channels for distances of up to 60 km. CWDM's wider spacing of up to 20 nm, when compared with DWDM's 1.6 nm, can tolerate much higher temperature fluctuations.
In 2004, IEEE standardized CWDM for 10-Gb Ethernet.
CWDM is also known as wide WDM.
Techopedia explains Coarse Wavelength Division Multiplexing (CWDM)
Although DWDM rules the long-haul network sector, CWDM is all set to help carriers take full advantage of their network capacity in the regional, metro and access network sectors. When compared to DWDM, CWDM supports fewer wavelengths; however, it is offered at a fraction of the cost of DWDM. This makes CWDM perfect for those areas having average traffic growth projections.
- As many as 16 CWDM wavelengths over a single pair of fiber
- CWDM channel spacing is 20 nm
- Distances as high as 120 km
- Scalable by hybrid CWDM/DWDM
- A highly cost-effective WDM solution
- Fiber exhaust relief
- In LAN and SAN connections
- Cost-effective WDM deployments in metro networks
- Main office to client-premise interconnection