This demonstration shows the potential of multi-mode transmission for future high-capacity backbone networksA group of researchers from the Network Research Institute of the National Institute of Information and Communications Technology (NICT, Japan) led by Georg Rademacher in collaboration with Nokia Bell Labs (U.S.), Prysmian Group (Prysmian, France, and the Netherlands), and the University of Queensland (Australia) succeeded in the world's first large-capacity transmission experiment with large mode multiplexing technology using 55 modes.55 modes were successfully multiplexed throughout the commercially adopted optical fiber transmission window (C-band), with a dramatic increase in spectral efficiency compared to conventional fibers and previous multi-mode transmission.A further expansion of transmission capacity can be anticipated by combining this technology with multi-band wavelength-division multiplexing technology.Hence, increasing the mode-count requires precisely engineered components such as multiplexers and fiber as well as complex processing techniques to recover the signals after mode-mixing and enable large-capacity transmission beyond the 15-modes already demonstrated.We could successfully receive polarization multiplexed 16 QAM signals at 184 wavelengths in the C wavelength band."