Nonlinear frequency conversion spanning from the ultraviolet to the mid-infrared (beyond 2.4 μm) is experimentally\ud demonstrated in multicladding silicon nitride (SiXNY ) waveguides. By adjusting the waveguide cross-section\ud the chromatic dispersion is flattened, which enhances both the efficiency and the bandwidth of the nonlinear conversion.\ud How accurately the dispersion is tailored is assessed through chromatic dispersion measurements and an\ud experiment/simulation comparison of the dispersive waves’ wavelength locations. Undesirable fluctuations of both\ud the refractive index and the dimensions of the waveguide during the fabrication process result in a dispersion unpredictability\ud of at least 20 ps/nm/km. Finally, manipulation of the effective refractive index allows for multiple third\ud harmonic generated tones spanning from 381 to 715 nm

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In this work, we present and analyze the ability of periodic SubWavelength Grating waveguides to act as mode filters. Moreover, we exploit this ability to design a novel kind of Add/Drop Mode Division Multiplexer exhibiting an extinction ratio over 20dB in the whole C-Band.

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