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Mode division multiplexed optical transmission enabled by allfiber mode multiplexer is investigated. The proposed all-fiber mode multiplexer is composed of consecutive mode selective couplers. It multiplexes or demultiplexes LP 01 , LP 11 , LP 21 , and LP 02 modes simultaneously. We demonstrate successful transmission of three spatial modes with 120 Gb/s PDM-QPSK signals over 15 km of four mode fiber by using 6x6 MIMO digital signal processing.doi:10.1364/oe.22.014229 pmid:24977520 fatcat:ia7cmiahrngolllqehhcdm5poy