We report graded index few mode fiber designs for mode-division multiplexing and demonstrate a 100-km fewmode fiber span with effective areas larger than 160 μm 2 and differential mode group delay of less than 6 ps/km.

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Adoption of multicore fibers will accelerate in high bandwidth density applications in next generation data centers once multicore connectors, transceiver coupling elements, cabling and other components are available to complement transceivers in end-to-end optical interconnects.