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We define the bandwidth requirements for OM4 performance within the wavelength window of 850 to 950nm. We have manufactured a MMF meeting these requirements while maintaining full compatibility with legacy OM4. This MMF enables 400Gbps using wavelength division multiplexing. IntroductionMultimode fibers (MMFs) have constantly evolved from the very beginning of optical communications industry through the recent and on-going explosion of the Ethernet traffic. Enabled by VCSEL technology and OM4 level performance, MMFs have proved to be the medium of choice for data communications, delivering reliable and cost-effective 10 to 100Gbps solutions.In order to meet the future increase of demand, the MMF capacity will ultimately have to be increased