JOEL WILLIAMS, ASSOCIATE EDITOR [email protected]JAKE SALTZMAN, NEWS EDITOR [email protected]BATH, England, March 17, 2023— Researchers at the University of Bath fabricated optical fiber that hosts topological supermodes across multiple light-guiding cores. The topological protection of the fibers prevents changes to the structure of the fiber edge modes when the intercore coupling — or how much light can move between each core — changes, such as in the event of a bend or twist. The fabrication approach targets the need for optical fibers that comprise a network to traverse natural landscapes, where the path is rarely straight and undisturbed. 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