Anderson, Miles H.Tikan, AlexeyTusnin, AleksandrDavydova, AlisaRiemensberger, JohannKippenberg, Tobias J.2025-10-012025-10-012025-09-302023-09-0410.1109/CLEO/Europe-EQEC57999.2023.102315872-s2.0-85214939413https://infoscience.epfl.ch/handle/20.500.14299/254511Recent developments of integrated photonic platforms have opened unique possibilities for on-chip generation of coherent and broadband frequency combs, both in normal and anomalous dispersion regimes via the generation of coherent nonlinear structures [1]. The potential role played by quasi-phase matching in dispersion engineering for this has remained an open question. As it happens, Si3N4 microresonator frequency combs typically employ waveguides with a large cross sections to reduce propagation loss and to reach anomalous dispersion. Coupling between transverse spatial modes can interfere with stable microcomb generation, so a narrow tapered mode ‘suppression’ section can be added to the microresonator in order to alleviate this issue [2] (Fig. 1(a)). In our experiment, we found that this tapered waveguide section provided precisely this quasi-phase matching between higher order of dispersion, leading to the emergence of Faraday Instability (FI) [3]. When combined with synchronous pulse-driving in a microresonator having normal dispersion on average [4], we observe FI combined with switching wave formation to generate ‘satellite’ switching wave microcombs.enfalsetext::conference output::conference proceedings::conference paper