Grassani, DavidePfeiffer, Martin H. R.Kippenberg, Tobias J.Bres, Camille-Sophie2019-01-232019-01-232019-01-232019-01-0110.1364/OL.44.000106https://infoscience.epfl.ch/handle/20.500.14299/153892WOS:000454111300028Silicon nitride (Si3N4) is commonly employed to integrate third-order nonlinear optical processes on a chip. Its amorphous state, however, inhibits significant second-order nonlinear response. Recently, second-harmonic generation enhancement has been observed in Si3N4 waveguides after an all-optical poling (AOP) method. Here we demonstrate that, after AOP of a Si3N4 waveguide, for up to 2 W of coupled pump power, the same telecom-band signal undergoes larger interband wavelength conversion efficiency, based on sum-frequency generation (SFG), than intraband wavelength conversion, based on four-wave mixing. We also confirm the appearance of a phase-matching condition after AOP by measuring the conversion bandwidth and efficiency of SFG at different pump wavelengths. (C) 2018 Optical Society of AmericaOpticsOpticsfrequency combsupercontinuum generation2nd-harmonic generationsilicontext::journal::journal article::research article