Optimized frequency comb spectrum of parametrically modulated bottle microresonators

Abstract Optical frequency combs generated by parametric modulation of optical microresonators are usually described lumped-parameter models, which do not account for the spatial distribution modulation. This study highlights importance this in Surface Nanoscale Axial Photonics (SNAP) platform, specifically elongated SNAP bottle with a shallow nanometre-scale effective radius variation along its axial length. have much smaller free spectral range and may no dispersion compared to other shapes (e.g., spherical toroidal), making them ideal generating lower repetition rates. By modulating parabolic resonantly adiabatically, we show that flatness bandwidth comb spectra can be enhanced optimizing The optimal achieved experimentally using piezoelectric, radiation pressure, electro-optical excitation microresonator.