We study various fiber designs which incorporate a highly nonlinear liquid, carbon disulfide, with the aim of designing a structure with the highest possible nonlinearity and at the same time a low and flattened dispersion at telecom wavelengths, as required for many all-optical processing devices. We observe that soft glass-based fibers cannot fully exploit the high nonlinearity of carbon disulfide, whereas a silica microstructured fiber with a selectively filled core allows excellent

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... n control and a nonlinear coefficient in excess of 6500 W 01 1 km 01 at telecoms wave- lengths. Index Terms-Nonlinear optics, optical fiber dispersion, optimization methods.