Evidence of intermodal dispersive wave generation mediated by intermodal cross-phase modulation (iXPM) between different transverse modes during supercontinuum generation in silicon nitride waveguides is presented. The formation of a higher-order soliton in one strong transverse mode leads to phase modulation of a second, weak transverse mode by iXPM. The phase modulation enables not only supercontinuum generation but also dispersive wave generation within the weak mode, that otherwise has insufficient power to facilitate dispersive wave formation. The nonlinear frequency conversion scheme presented here suggests phase-matching conditions beyond what is currently known, which can be exploited for extending the spectral bandwidth within supercontinuum generation.

We demonstrate a waveguide-based OPO exploiting the emerging Ta2O5 platform and investigate its feasibility for integration. Pumped synchronously at 1.55 µm wavelength, the OPO provided up to 6 pJ pulse energy, tunable by ±20 nm around 1.46 µm wavelength.

We present dispersive wave generation via intermodal cross-phase modulation. The interaction between a higher-order soliton in one transverse mode and an orthogonal, low-intensity mode causes the latter to radiate a dispersive wave.

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We demonstrate dispersive wave generation in a low-intensity transverse mode on account of intermodal cross-phase modulation driven by an orthogonal mode excited with a high-intensity pulse.