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It is now well established that silicon nitride offers many advantages for integrated nonlinear photonics. Pushed by recent progress in fabrication, we now have access to very low loss waveguides while maintaining large flexibility in terms of dispersion engineering, both essential for the design of efficient nonlinear systems. As such many nonlinear optical demonstrations, mainly based on third order effects in the telecom band, have been performed. Pushing the applications over the entire accessible spectral range of silicon nitride, from the visible to the middle infrared, as well as offering completely new horizon of applications by inducing effective second-order effects, would provide new and essential element to nonlinear integrated photonic toolbox. In this talk I will review progress in reaching the middle infrared for sensing applications as well as leveraging all-optical poling to enhance the typically weak second-order nonlinearities of the platform.
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