Stabilization of optical bubbles near the axis of a helical lightguide

It is shown numerically that in a lightguide possessing a helical symmetry, stable solutions exist for the coupled nonlinear Schrodinger equations describing interaction between the left and the right circular polarizations of an optical wave in a defocusing Kerr medium with anomalous dispersion, in the form of stationary rotating oblong bubbles with attached several optical vortices. A bubble is an arbitrary long quasi-cylindrical three-dimensional cavity inside the first component, filled with the second component. At each of the two ends of the bubble, two stationary two-dimensional configurations are connected, in one of them only the first component with separated vortices is present while in the other one there is a single multiple vortex with a filled core. The cross-section of the lightguide, the screw pitch, the number of vortices, and the background intensity of the first component influence upon the profile of the bubble, but the total amount of the trapped second component does not.