title: Multimode fiber devices with single-mode performance.
abstract: A taper transition can couple light between a multimode fiber and several single-mode fibers. If the number of single-mode fibers matches the number of spatial modes in the multimode fiber, the transition can have low loss in both directions. This enables the high performance of single-mode fiber devices to be attained in multimode fibers. We report an experimental proof of concept by using photonic crystal fiber techniques to make the transitions, demonstrating a multimode fiber filter with the transmission spectrum of a single-mode fiber grating.
authors.affiliation: Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK.
authors.forename: S G
authors.initials: SG
authors.lastname: Leon-Saval
authors.forename: T A
authors.initials: TA
authors.lastname: Birks
authors.forename: J
authors.initials: J
authors.lastname: Bland-Hawthorn
authors.forename: M
authors.initials: M
authors.lastname: Englund