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The confinement loss and bend loss properties of all-solid photonic band gap fibers with an array of rings doped with high-index material are investigated. The calculated results show that for a specific structure, the confinement loss and the critical bend radius are reduced simultaneously in some band gaps by increasing the inner diameter of ring, which provides a useful guide and a theoretical...
A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropic perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and optimizing the geometrical parameters, we find...