Open AccessCut-off analysis of 19-cell Yb-doped double-cladding rod-type photonic crystal fibers
Author(s) -
Federica Poli,
Enrico Coscelli,
Thomas Tanggaard Alkeskjold,
D. Passaro,
Annamaria Cucinotta,
Lasse Leick,
Jes Broeng,
Stefano Selleri
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.009896
Subject(s) - cladding (metalworking) , photonic crystal fiber , materials science , all silica fiber , optics , plastic clad silica fiber , hard clad silica optical fiber , double clad fiber , fiber laser , zero dispersion wavelength , optical fiber , wavelength , laser , optoelectronics , graded index fiber , fiber , composite material , fiber optic sensor , physics
Yb-doped double-cladding large mode area rod-type photonic crystal fibers are a key component for power scaling in fiber laser systems. Recently, designs with 19-cell core defect, that is with 19 missing air-holes in the center of the photonic crystal cladding, have been proposed, with reported core diameter up to 100 μm. In this paper an analysis of the cut-off wavelength of the first high-order mode in such low-NA fibers is reported, accounting for different approaches for the definition of the cladding effective index. Results have shown that taking into account the finite fiber cross-section and considering the first cladding mode of the actual fiber is mandatory to obtain a correct estimate of the cut-off wavelength.