title: Large-mode-area ytterbium-doped fiber amplifier with distributed narrow spectral filtering and reduced bend sensitivity.
abstract: A large-mode area polarization maintaining single-mode ytterbium-doped fiber amplifier with distributed narrow passband filtering is demonstrated. The fiber passband is 40 nm wide and centered at 1070 nm for efficient filtering of both short- and long-wavelength amplified spontaneous emission as well as stimulated raman scattering and four-wave-mixing. The fiber shows reduced bend sensitivity, has a mode field diameter of 27 microm and exhibits a slope efficiency of more than 65%.
authors.affiliation: NKT Photonics, Blokken 84, 3450 Birkerød, Denmark. tta@nktphotonics.com
authors.forename: Thomas Tanggaard
authors.initials: TT
authors.lastname: Alkeskjold