loss that can be achieved from a decagonal photonic crystal fiber (D-PCF). The finite
difference method with anisotropic perfectly matched boundary layer (PML) is used for the
numerical analysis. It is demonstrated that it is possible to design a four-ring D-PCF with
ultra-flattened dispersion of 0< cd0215e. gif> 0.69 ps/(nm-km) in a 1.30 to 1.75 µm
wavelength range and 0< cd0215e. gif> 0.22 ps/(nm-km) in a 1.35 to 1.65 µm wavelength …