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Engineering Waveguide Nonlinear Effective Length via Low Index Thin Films

The nonlinear response of an integrated optical device should take into account the propagation distance relevant to the device. In this paper, we present a CMOS-compatible integrated optical platform with an optimized nonlinear response for propagation lengths of tens of microns. The platform is based on a low-index thin film, interfaced with a silicon-on-insulator guiding layer. The experimental results enable the development of integrated optical networks with low-power nonlinear activation functions.