Si-rich silicon-nitride waveguides for optical transmissions and towards wavelength conversion around 2 $mu$m

We show that subwavelength silicon-rich nitride waveguides efficiently sustain high-speed transmissions at 2 $mu$m. We report the transmission of a 10 Gbit/s signal over 3.5 cm with negligible power penalty. Parametric conversion in the pulsed pump regime is also demonstrated using the same waveguide structure with an efficiency as high as -18 dB.