Mixing second- and third-order nonlinear interactions in nanophotonic lithium-niobate waveguides

In this paper, we have investigated the interplay between second and third-order nonlinearities in lithium-niobate waveguides with strong waveguide dispersion using uniform linearly-chirped poling patterns at input powers pico-joule range. We implemented accurate unidirectional pulse propagation model to take into account all possible nonlinear interactions inside these structures. particular, period has been designed quasi-phase-match single multiple sum- difference-frequency generation processes. shown how can be used as an additional degree of freedom tailor output spectra chip-based unprecedented way.