1 Tb/s transmission at 15 bit/s/Hz spectral efficiency with mode division multiplexing
We report for the first time a 1 Tb/s transmission over a single core fiber, by using 10 spatial modes, namely the two polarization modes of 5 distinct spatial modes. Each one carries 100 Gb/s per mode per polarization, modulated with a 56 GBd quaternary phase-shift keying modulator. This optical channel occupies a 66 GHz-wide slot in a wavelength division multiplexed comb made of 3 channels. This results in a record spectral efficiency of 15.2 b/s/Hz. A bit-error rate below the error correcting limit after 20 km has been measured.