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An optical transport network based on multimode/multicore fibers includes a mode-multiplexer to multiplex independent data streams from one or more transmitters; a multimode erbium-doped fiberamplifier (MMEDFA) to compensate for MMF loss; a multimode optical add-drop multiplexer (MM OADM) to add and/or drop multimode channels in multi mode networks; a multimode optical cross-connect; and a mode-demultiplexer to separate various mode streams to one or more receivers.