Abstract
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
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