Whispering gallery modes in optical fibers based on reflectionless potentials

We consider an optical fiber with nanoscale variation of the effective fiber radius supporting whispering gallery modes slowly propagating along the fiber, and reveal that the radius variation can be designed to support reflectionless propagation of these modes. We show that reflectionless modulations can realize control of transmission amplitude and temporal delay, while enabling close packing due to the absence of cross-talk, in contrast to conventional potentials.Comment: 4 pages, 3 figure

Frequency combs in nonlinear SNAP fiber resonators

We suggest Surface Nanoscale Axial Photonic fiber resonators for frequency comb generation, and show that precise control of the fiber radius can facilitate combs with ultrafine spacing beyond the fundamental limit of conventional ring resonator

Coupling of Whispering Gallery Modes in Optical Fiber Resonators Based on Reflectionless Potential

Photonic platforms combining the benefits of microscopic dimensions, flexibility, and control are of great interest due to the present and anticipated breakthrough capabilities in optical computing and communications. It was recently demonstrated that high-quality-factor traps for photons can be created in an optical fiber with nanoscale variation of an effective fiber radius [1, 2], which can account for the modification of both the fiber radius as well as the medium refractive index. Such fiber resonators function as surface nanoscale axial photonics (SNAP) devices, supporting whispering gallery modes (WGMs) which circulate near the fiber surface and slowly propagate in axial direction. The SNAP platforms enable precise control over the mode characteristics thanks to the record breaking sub-angstrom fabrication precision and ultralow scattering losses