AAH-modulated cylindrical claddings create topological gaps and radially localized edge states, giving photonic crystal fibers and ring resonators topological protection against disorder.
For any mode a cutoff frequency is defined as the min- imum frequency to have a positive β2 = ω2 c2εj−k2 j value i.e
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Topological photonic crystal fibers and ring resonators
AAH-modulated cylindrical claddings create topological gaps and radially localized edge states, giving photonic crystal fibers and ring resonators topological protection against disorder.