We introduce discrete vortex solitons and vortex breathers in circular arrays of nonlinear waveguides. The simplest vortex breather in a four-waveguide coupler is a nonlinear dynamic state changing its topological charge between $+1$ and -1 periodically during propagation. We find the stability domain for this solution and suggest an all-optical vortex switching scheme.
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Desyatnikov et al. (2011) studied this question.
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