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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 theoretically and experimentally identify guidance regimes in filled-core PCF. Depending on air-filling fraction and pitch, the fibre may be singlemode by TIR or PBG guidance. The simultaneous guidance by TIR and PBG is predicted.
The second mode extinction wavelength of air-silica microstructure optical fibers is measured by means of a method based on the azimuthal analysis of the far-field at the fiber exit. The fiber curvature influence is characterized.
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