An optical networking technique sending many wavelengths of light down one fiber, multiplying interconnect capacity for AI clusters.
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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.