Commonly, the spectra of high Q-factor microresonators are fixed or only weakly tunable, which limits their versatility. To address this limitation, we demonstrate continuous tunability of the axial Free Spectral Range (FSR) of parabolic microresonators created by bending a 125 μm radius optical fiber segment. By controlling the bent fiber profile with linear stages affixed to its ends, we vary its FSR between 1.9 pm and 2.7 pm for more than 65 equally spaced eigenmodes. We show that the FSR tunability can be achieved with precision better than 0.2 pm. The demonstrated tunability, together with the inherently small FSR of our parabolic microresonators, unlock their potential applications including optical frequency comb generation and frequency conversion.
Lumped-elements models are commonly used for the analysis of optical frequency combs (OFCs) generated by the parametric modulation of optical microresonators. However, these models do not take into account the spatial modulation distribution (SMD) which is critical for the optimization of the OFCs formation. Here, we consider a parabolic SNAP microresonator (SMR) with harmonically modulated parameters and determine the optimum SMDs for the resonant and adiabatic excitation of the SMR parameters. We suggest that the determined optimal SMD can be experimentally realized using piezoelectric, radiation pressure or linear electro-optical excitation of an SMR.
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