title: Hybrid Ytterbium-doped large-mode-area photonic crystal fiber amplifier for long wavelengths.
abstract: A large-mode-area Ytterbium-doped photonic crystal fiber amplifier with build-in gain shaping is presented. The fiber cladding consists of a hexagonal lattice of air holes, where three rows are replaced with circular high-index inclusions. Seven missing air holes define the large-mode-area core. Light confinement is achieved by combined index and bandgap guiding, which allows for single-mode operation and gain shaping through distributed spectral filtering of amplified spontaneous emission. The fiber properties are ideal for amplification in the long wavelength regime of the Ytterbium gain spectrum above 1100 nm, and red shifting of the maximum gain to 1130 nm is demonstrated.
authors.affiliation: DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Denmark. srpe@fotonik.dtu.dk
authors.forename: Sidsel R
authors.initials: SR
authors.lastname: Petersen
authors.forename: Thomas T
authors.initials: TT
authors.lastname: Alkeskjold
authors.forename: Federica
authors.initials: F
authors.lastname: Poli
authors.forename: Enrico
authors.initials: E
authors.lastname: Coscelli
authors.forename: Mette M
authors.initials: MM
authors.lastname: Jørgensen
authors.forename: Marko
authors.initials: M
authors.lastname: Laurila
authors.forename: Jesper
authors.initials: J
authors.lastname: Lægsgaard
authors.forename: Jes
authors.initials: J
authors.lastname: Broeng
mesh_terms: D000669:Amplifiers, Electronic; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D015018:Ytterbium