title: In-resonator variation of waveguide cross-sections for dispersion control of aluminum nitride micro-rings.
abstract: We propose and demonstrate a dispersion control technique by combination of different waveguide cross sections in an aluminum nitride micro-ring resonator. Narrow and wide waveguides with normal and anomalous dispersion, respectively, are linked with tapering waveguides and enclosed in a ring resonator to produce a total dispersion near zero. The mode-coupling in multimoded waveguides is also effectively suppressed. This technique provides new degrees of freedom and enhanced flexibility in engineering the dispersion of microcomb resonators.
authors.forename: Hojoong
authors.initials: H
authors.lastname: Jung
authors.forename: Menno
authors.initials: M
authors.lastname: Poot
authors.forename: Hong X
authors.initials: HX
authors.lastname: Tang