What is coarse wavelength division multiplexing (CWDM)?Coarse wavelength division multiplexing is a multiplexing technique that increases fiber capacity by combining multiple light wavelengths on a single CWDM fiber.
Coarse wavelength division multiplexing (CWDM) is a multiplexing technique that transmits multiple data signals over a single optical fiber by using different wavelengths (colors) of light. CWDM is characterized by its wider channel spacing—typically 20 nanometers (nm) apart—which allows up to 18 channels on a single fiber.
Coarse wavelength division multiplexing is protocol-independent. CWDM supports transmission of various data types simultaneously, typically ranging from 1270 nm to 1610 nm. In data center environments, CWDM technology provides a cost-effective solution for short- to medium-distance connections (up to approximately 70 km) between facilities or campus buildings. Its simplified design eliminates the need for complex cooling systems, making CWDM an economical choice for expanding network capacity in enterprise data centers. A CWDM system’s plug-and-play implementation and lower power requirements make it particularly valuable for maximizing connectivity while minimizing infrastructure costs and complexity.
CWDM vs. DWDM channel spacing comparison diagram. Source: ViaLite Communications.