Fig. 2From: Optical vortices in waveguides with discrete and continuous rotational symmetrySchematic of the stability regions for vortices with topological charge S=1 (a), S=2 (b), S=3 (c), and S=4 (d) with respect to the number of cores in the MCF system. Blue and green bars in plots denote the parameter areas with stable vortices in the MCF without and with central core, respectivelyBack to article page