Photonic Crystal Fiber as Low Loss Dispersion Flattened Fiber and Ultra-Low Confinement Loss

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In this paper, a photonic crystal fibre structure with different air hole sizes is proposed. Multipole method is used for the analysis of this PCF. The PCF has five rings of air holes to analyze the dispersion and confinement loss properties. It is found that the proposed PCF has ultra-flattened negative dispersion over C-band and very low confinement loss that can be negligible throughout the telecommunication band. The design strategy to achieve these properties is based on the optimization of d1 (diameter of inner two rings) and d2 (diameter of outer three rings).