title: Single-mode analysis of Yb-doped double-cladding distributed spectral filtering photonic crystal fibers.
abstract: Hybrid large mode area Ytterbium-doped double-cladding photonic crystal fibers with anti-symmetric high refractive index inclusions provide efficient amplified spontaneous emission spectral filtering. Their performances have been analyzed by numerical simulations and experimental measurements. In particular, the fiber single-mode behaviour has been studied, by taking into account the fundamental and the first higher-order mode. Two approaches, the core down-doping and the reduction of the air-hole diameter in the inner cladding, have been successfully applied to reduce the higher-order mode content, regardless of the bending of the doped fiber, without significantly affecting its spectral filtering properties.
authors.affiliation: Information Engineering Department, University of Parma, Parma, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Coscelli
authors.forename: Federica
authors.initials: F
authors.lastname: Poli
authors.forename: Thomas T
authors.initials: TT
authors.lastname: Alkeskjold
authors.forename: Davide
authors.initials: D
authors.lastname: Passaro
authors.forename: Annamaria
authors.initials: A
authors.lastname: Cucinotta
authors.forename: Lasse
authors.initials: L
authors.lastname: Leick
authors.forename: Jes
authors.initials: J
authors.lastname: Broeng
authors.forename: Stefano
authors.initials: S
authors.lastname: Selleri
mesh_terms: D017076:Computer-Aided Design; D003460:Crystallization; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008027:Light; D012542:Scattering, Radiation; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D015018:Ytterbium