Topological Charge Switch: Topological Charge Switch in Active Multi‐Core Fibers (Ann. Phys. 9/2021)

Active multi-core fibers represent a powerful platform for coding information via power, phase, frequency, and topological charge, as presented by Petra P. Beličev, Sergei Turitsyn, and co-workers in article number 2100108. Depending on the gain distribution between the periphery and central core, the system supports multiple functions in applications: from high-power fiber lasers to vortex carriers and selective topological charge switchers.