Ultra-low crosstalk, CMOS compatible waveguide crossings for densely integrated photonic interconnection networks

We explore the design space for optimizing CMOS compatible waveguide crossings on a silicon photonics platform. This paper presents simulated and experimental excess loss and crosstalk suppression data for vertically integrated silicon nitride over silicon-on-insulator waveguide crossings. Experimental results show crosstalk suppression exceeding. 49/-44 dB with simulation results as low as. 65/-60 dB for the TE/TM mode in a waveguide crossing with a 410 nm vertical gap. (C) 2013 Optical Society of America