17 May 2007 Chosen aspects of negative dispersion generation in index guiding photonic crystal fibers
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This paper deals with a new method of generation negative dispersion by introducing curvature into the fiber. The aim is to make a proposal of a photonic structure that could be an optical dispersion compensator. Strong deformation of fundamental mode for a certain bend radius results with negative dispersion of thousands of ps/nm/km at required wavelength. The structure mustn't be symmetrical because introducing a curvature strictly defines direction of deformation of the fundamental mode and splitting light into external holes making the mode highly dispersive. The dispersion is the same for a symmetrical lattice and for a lattice with holes only in regions with strong confinement. There is also a proposal of a unique detection method to precise the bend radius for which negative dispersion occurs. Only for certain value of bend radius, for which cladding mode can appear at propagated wavelength, it is possible to confine the mode and cause optical nonlinearities. Negative dispersion peak is accompanied by bending loss. Bending loss is interesting because of the possibility of detection of this unique combination with negative dispersion. There are local maxima of losses in loss wavelength dependency coming from the cladding modes. These cladding modes appear only for certain values of bending and the fundamental mode is highly dispersive.
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M. Lucki, M. Lucki, L. Bohac, L. Bohac, J. Burcik, J. Burcik, } "Chosen aspects of negative dispersion generation in index guiding photonic crystal fibers", Proc. SPIE 6588, Photonic Crystal Fibers, 65880W (17 May 2007); doi: 10.1117/12.722603; https://doi.org/10.1117/12.722603

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