Glossary term
DWDM (Dense Wavelength Division Multiplexing)
An optical networking technique sending many wavelengths of light down one fiber, multiplying interconnect capacity for AI clusters.
DWDM (Dense Wavelength Division Multiplexing) is an optical networking technique that transmits many independent wavelengths of light over a single fiber, multiplying the data capacity of each physical link. It is increasingly relevant for AI clusters, where the volume of inter-GPU traffic strains conventional interconnect. DWDM is part of the optical-networking layer that benefits from the scale-out of training clusters. See Networking & Optical 101.