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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 27, Iss. 22 — Nov. 15, 2009
  • pp: 4935–4942

Suppression of Higher-Order Modes by Segmented Core Doping in Rod-Type Photonic Crystal Fibers

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

Journal of Lightwave Technology, Vol. 27, Issue 22, pp. 4935-4942 (2009)

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A large mode area Yb-doped rod-type photonic crystal fiber design with a low refractive index ring in the core is proposed to provide an improved suppression of the first higher-order mode compared to the case of uniform core doping, in a way which is more robust against fluctuations in the refractive index value. After applying a scalar step-index model for a first parameter optimization of the proposed design, a full-vector modal solver based on the finite element method has been exploited to analyze the guided mode overlap and effective area for the most promising fibers identified. Finally, a spatial and spectral amplifier model has been considered to study the gain competition among the fundamental and the first higher-order mode guided in the Yb-doped rod-type fibers. Results have demonstrated the effectiveness of the low refractive index ring in suppressing the higher-order mode, thus providing an effectively single-mode behavior for the rod-type fibers.

© 2009 IEEE

Federica Poli, Jesper Lægsgaard, Davide Passaro, Annamaria Cucinotta, Stefano Selleri, and Jes Broeng, "Suppression of Higher-Order Modes by Segmented Core Doping in Rod-Type Photonic Crystal Fibers," J. Lightwave Technol. 27, 4935-4942 (2009)

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