Record high-order mode-division-multiplexed transmission on chip using gradient-duty-cycle subwavelength gratings

We demonstrate 16-channel mode (de)multiplexers on a silicon chip using gradientduty-cycle subwavelength gratings. A 1.51-Tbit/s/polarization/wavelength capacity is achieved at 1550 nm with 7 neighboring 50-GHz spaced ASE channels.