structures, such as square lattice, circular-ring, This paper presents dispersion characteristics of a honeycomb, cobweb and octagonal fibers were decagonal photonic crystal fiber (D-PCF) for the first proposed [3]-[7] to design the PCF. The chromatic time. The finite difference method (FDM) with an dispersion of PCF is very important for practical anisotropic perfectly matched boundary layer (PML) applications to nonlinear optics, telecommunication is used to investigate the chromatic dispersion systems and dispersion compensation [8]-[13]. In characteristics. It is shown through numerical index guiding PCFs, by changing the air-hole simulation results that D-PCFs can be used as a arrangement, air-hole diameter, hole to hole spacing dispersion compensating fiber for their high negative and the number of rings suitable guiding properties dispersion slope characteristic. The dependency of can be obtained. Recently, O-PCF has drawn much chromatic dispersion with pitch, wavelength and more attention [14] because of its attractive features air-hole diameters are also presented. Moreover, like wider wavelength range operating in a single dispersion properties of D-PCF have been compared mode region, more circular field distribution, and with that of the octagonal PCF (0-PCF) and lower confinement loss than H-PCFs. In this paper, hexagonal PCF (H-PCF), respectively. the dispersion of silica based D-PCF are analyzed Index Terms-Photonic crystal fiber, chromatic using the FDM method. It has been shown that D-PCF has smaller effective area than that of the dispersion, finite difference method, effective area O-PCF and the H-PCF under the same parameters.
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