title: Wavelength-independent all-fiber mode converters.
abstract: We have used two different photonic crystal fiber (PCF) techniques to make all-fiber mode converters. An LP(01) to LP(11) mode converter was made by the ferrule technique on a drawing tower, and an LP(01) to LP(02) mode converter was made by controlled hole inflation of an existing PCF on a tapering rig. Both devices rely on adiabatic propagation rather than resonant coupling; so high extinction was achieved across a wide wavelength range.
authors.affiliation: Department of Physics, University of Bath, Claverton Down, Bath, UK.
authors.forename: K
authors.initials: K
authors.lastname: Lai
authors.forename: S G
authors.initials: SG
authors.lastname: Leon-Saval
authors.forename: A
authors.initials: A
authors.lastname: Witkowska
authors.forename: W J
authors.initials: WJ
authors.lastname: Wadsworth
authors.forename: T A
authors.initials: TA
authors.lastname: Birks