We discuss new optical fibers for high data rate short reach systems in data center applications. We review first recent
development in MMF to improve system performance including high bandwidth MMF, bend insensitive MMF and
MMF optimized for high bandwidth at longer wavelengths of 1060 nm or 1310 nm. Then we present a new universal
fiber that can be used for both multimode transmission at 850 nm and single mode transmission at 1310 nm for data
centers. Finally, we present a promising solution for high density parallel optical data links by using space division
multiplexing (SDM) over multicore fibers and few mode fibers.