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In new generation of optical communication networks, simultaneous transmission of several information channels has become possible over a single optical fiber. But dispersion and dispersion slope of optical fibers are important factors, which limit high capacity optical fiber communication systems to perform high speed transmission.
In this paper, silica core photonic crystal fibers (PCFs) with three and six air–hole rings in the cladding are investigated for effective refractive index, propagation constant and dispersion characteristics, using FDTD method. It is shown that by increasing the number of the air–hole rings in the cladding around the core, the negative dispersion of the PCFs will increase, too. The obtained negative dispersion of –300 ps/nm.km is comparatively high with respect to the published results in the related literature.
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