We demonstrate the stabilization of optical vortices with higher-order fractional topological charges in a discrete photonic system - a ring-shaped array of optical fibers. It is shown that the system supports stable supermodes with charges p=3/2 and 5/2, which is confirmed by interference patterns and phase front analysis. The study of the phase profile evolution from the near-field zone (R=0.3r₀) to the far-field zone (R=10r₀) for the mode with p=3/2 proves the preservation of its topological structure. Here, R is the radius of a circle centered on the fiber array center, and r₀=100 μm is the characteristic distance scale. The obtained results open up prospects for light control in photonic devices leveraging the topological stabilization of complex light fields. Keywords: optical vortex, higher-order fractional topological charges, ring arrays of optical fibers, interference, phase distribution.

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Дата начала обработки статистических данных - 27 января 2016 г.