Cut-off analysis of 19-cell Yb-doped double-cladding rod-type photonic crystal fibers

F. Poli, E. Coscelli, T. T. Alkeskjold, D. Passaro, A. Cucinotta, L. Leick, Jes Broeng, S. Selleri

Research output: Contribution to journalJournal articleResearchpeer-review


Yb-clopecl 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 show n 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.
Original languageEnglish
JournalOptics Express
Issue number10
Pages (from-to)9896-9907
Publication statusPublished - 2011
Externally publishedYes

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