Majlesi Journal of Electrical Engineering A New Design of As2Se3‎ Chalcogenide Glass Photonic Crystal Fiber with Ultra-Flattened Dispersion in Mid-Infrared Volume 8 (2014) Issue 4, November 2014 2024 02 21 A New Design of As2Se3‎ Chalcogenide Glass Photonic Crystal Fiber with Ultra-Flattened Dispersion in Mid-Infrared EN Mahmood Seifouri Shahid Rajaee Teacher Training University Saeed Olyaee Department of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran 16788-15811, Iran. Moslem Dekamin Shahid Rajaee Teacher Training University Journal Article 2024 02 21 In this paper, we report a new design of As2Se3‎ chalcogenide glass photonic crystal fiber (PCF) with ultra-flattened dispersion at mid-infrared wavelength range. We have used the plane wave expansion method (PWE) for designing the structure of As2Se3‎ glass PCF at different wavelength windows. In the proposed structure with hole to hole spacing and , the negative dispersion is -1025 ps/nm/km at the wavelength of 1.55µm and also an ultra-flattened dispersion is achieved at the wavelength range of 3.5-18μm. Hence such PCFs have a high potential to be used as dispersion compensating fibers at 1.55µm wavelength in optical communication systems. The ultra-flattened dispersion at the wavelength range of 3.5-18μm can be employed to achieve high power supercontinuum generation. The nonlinear coefficient of the proposed PCF is  at the wavelength of 1.55µm. Chalcogenide glasses are known to have both high transparency and nonlinearity in a wide range of infrared wavelengths compared to silica glasses.