23 Tbit/s transmission over 17-km conventional 50-??m graded-index multimode fiber

We demonstrate combined mode- and wavelength multiplexed transmission of 23 Tbit/s over 17 km conventional graded-index multimode fiber. We selectively couple and receive all spatial modes in the lowest 3 mode-groups of the multimode fiber using photonic-lanterns based mode-couplers. The transmitted signals are recovered by 12??12 MIMO digital signal processing.