Abstract
Yb-doped rod-type photonic crystal fibers are double-cladding large-mode-area fibers with the outer dimension of few millimeters. The higher-order mode suppression through gain filtering has been demonstrated in these fibers, by enlarging the core radius from 30 μm to 40 μm, while keeping fixed the doped-area dimension. Sectioned core doping, obtained by adding a low refractive index ring in the fiber core, has been taken into account, in order to design fibers with an effective single-mode behaviour. Moreover, the gain competition among the guided modes in the enlarged-core rod-type PCFs has been analyzed with a spatial and spectral amplifier model, showing the positive effect of the gain filtering in improving the fundamental mode amplification, to the detriment of the higher-order mode one. Comparisons have been made with the properties of rod-type fibers with 30 μm core radius, both with uniform and sectioned doping, in order to show the effectiveness of the down-doped ring in the enlarged core for the higher-order mode suppression.
Original language | English |
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Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 7714 |
Pages (from-to) | 77140I |
Number of pages | 8 |
ISSN | 0277-786X |
DOIs | |
Publication status | Published - 2010 |
Event | Photonics Europe 2010: Photonic Crystal Fibers IV - The Square Conference Center, Brussels, Belgium Duration: 12 Apr 2010 → 16 Apr 2010 http://spie.org/x40293.xml |
Conference
Conference | Photonics Europe 2010 |
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Location | The Square Conference Center |
Country/Territory | Belgium |
City | Brussels |
Period | 12/04/2010 → 16/04/2010 |
Internet address |