Higher-order mode suppression in rod-type photonic crystal fibers with sectioned doping and enlarged core

F. Poli; E. Coscelli; D. Passaro; A. Cucinotta; S. Selleri; J. Lægsgaard; J. Broeng

doi:10.1117/12.853779

14 May 2010 Higher-order mode suppression in rod-type photonic crystal fibers with sectioned doping and enlarged core

F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, J. Lægsgaard, J. Broeng

Proceedings Volume 7714, Photonic Crystal Fibers IV; 77140I (2010) https://doi.org/10.1117/12.853779
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

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.

Citation Download Citation

F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, J. Lægsgaard, and J. Broeng "Higher-order mode suppression in rod-type photonic crystal fibers with sectioned doping and enlarged core", Proc. SPIE 7714, Photonic Crystal Fibers IV, 77140I (14 May 2010); https://doi.org/10.1117/12.853779

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