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Mode division multiplexing (MDM)–using a multimode optical fiber’s N spatial modes as data channels to transmit N independent data streams–has received interest as it can potentially increase optical fiber data transmission capacity N-times with respect to single mode optical fibers. Two challenges of MDM are (1) designing mode (de) multiplexers with high mode selectivity (2) designing mode (de) multiplexers without cascaded beam splitting’s 1/N insertion loss. One spatial mode basis that has received interest is that of orbital angular momentum (OAM) modes. In this paper, using a device referred to as an OAM mode sorter, we show that OAM modes can be (de) multiplexed over a multimode optical fiber with higher than− 15 dB mode selectivity and without cascaded beam splitting’s 1/N insertion loss. As a proof of concept, the OAM modes of the LP11 mode group (OAM− 1, 0 and OAM+ 1, 0), each carrying 20 …