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19 May 2009 Guiding and amplification properties of rod-type photonic crystal fibers with sectioned core doping
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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 Ybdoped 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.
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S. Selleri, F. Poli, D. Passaro, A. Cucinotta, J. Lægsgaard, and J. Broeng "Guiding and amplification properties of rod-type photonic crystal fibers with sectioned core doping", Proc. SPIE 7357, Photonic Crystal Fibers III, 73570O (19 May 2009); https://doi.org/10.1117/12.820617
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