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Dissipative Kerr solitons (DKS) in high-Q microresonators provide femtosecond pulses and frequency combs with high-repetition rate; they have seen applications from optical spectroscopy, data transfer and laser ranging to astronomical spectrograph calibration. Usually DKS are generated in ring-resonators, where only a limited set of design parameters are available. Here, we demonstrate DKS in an integrated high-Q Fabry-Perot microresonator formed by two photonic crystal reflectors in a waveguide. This platform opens a large design space with opportunities for extension of DKS into new wavelength ranges as well as generally phase-matching and spectral engineering for broadband frequency conversion in integrated nonlinear microresonators.
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