Guiding and amplification properties of rod-type photonic crystal fibers with sectioned core doping

Stefano Selleri, Federica Poli, Davide Passaro, Annamaria Cucinotta, Jesper Lægsgaard, Jes Broeng

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Rod-type photonic crystal fibers are large mode area double-cladding fibers with an outer diameter of few millimeters which can provide important advantages for high-power lasers and amplifiers. Numerical studies have recently demonstrated the guidance of higher-order modes in these fibers, which can worsen the output beam quality of lasers and amplifiers. In the present analysis a sectioned core doping has been proposed for Yb-doped rod-type photonic crystal fibers, with the aim to improve the higher-order mode suppression. A full-vector modal solver based on the finite element method has been applied to properly design the low refractive index ring in the fiber core, which can provide an increase of the differential overlap between the fundamental and the higher-order mode. Then, the gain competition among the guided modes along the Yb-doped rod-type fibers has been investigated with a spatial and spectral amplifier model. Simulation results have shown the effectiveness of the sectioned core doping in worsening the higher-order mode overlap on the doped area, thus providing an effective single-mode behavior of the Yb-doped rod-type photonic crystal fibers.
Original languageEnglish
Title of host publicationProceedings of the International Society for Optical Engineering. 2009
Volume7357
PublisherSPIE - International Society for Optical Engineering
Publication date2009
Pages735700-735708
ISBN (Print)9780819476319
DOIs
Publication statusPublished - 2009
EventSPIE Optics + Optoelectronics 2009 - Prague, Czech Republic
Duration: 20 Apr 200923 Apr 2009
Conference number: 7357

Conference

ConferenceSPIE Optics + Optoelectronics 2009
Number7357
CountryCzech Republic
CityPrague
Period20/04/200923/04/2009

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