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In this paper, we propose, through different theoretical examples of composite fibre designs, some alternative ways to push up the limits of active optical fibres. Highly ytterbium-doped large cores are required for high power delivery and low non linear limitations. Such cores usually support several guided modes. We demonstrate in this paper that by surrounding the core with a tailored cladding,...
A scalar beam propagation method is used to study confinement losses of air-clad fibers versus their geometrical parameters. The method is also applied to the computation of multimode guidance and pump absorption in two different microstructured fibers with high refractive index difference.
We propose a new microstructured fiber design combining large and highly doped area, low bend loss, high pump absorption and single-mode propagation. An original guiding regime is governed by characteristics of high index cladding rods.
We introduce the design of an amplifying and nonlinear microstructured optical fiber. This unusual guide permits the nonlinear propagation with regeneration of the pump wave. The first fabricated structure is experimentally tested for supercontinuum generation.
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