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Presented work is a study of dispersion properties of photonic crystal fibers. The main objective is to design photonic crystal fibers suitable for potential compensation of group velocity dispersion of optical signals. New fiber structures are proposed, for example, a flattened-dispersion compensating photonic crystal fiber for broadband utilization in high-speed transmission systems is presented. The structure shows flattened negative value of dispersion over the O, C, and L bands. The fiber can eventually get applied in broadband optical signal recovery in systems with wavelength division multiplexing. Last but not least, a dual-core compensating microstructured fiber is optimized in order to achieve low dispersion and low loss at the C-band. Results presented in this work are obtained by using the FDFD method.

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