Design of new square-lattice photonic crystal fibers for optical communication applications

In this paper, two new square-lattice photonic crystal fibers (PCFs) are designed and proposed. Both fibers have identical structures with five air-hole rings, yet the diameter of air-holes differ in their structures. Finite-difference time-domain (FDTD) method with the perfectly matched layers (PML) boundary conditions has been used to investigate these fibers. The proposed photonic crystal fibers exhibit properties of ultra-flattened nearly zero dispersion and low confinement loss in wavelength range of 1.2 to 1.7 µm. Dispersion slope in both fibers is about 7 ◊ 10

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