Design of a Photonic Crystal Fiber with Improved Dispersion and Confinement Loss Over All Telecommunication Bands

A novel photonic crystal fiber (PCF) structure with two different air-hole sizes is proposed. The PCF has ultra-flattened dispersion and negligible confinement loss characteristics throughout the telecommunication bands (O-band to L-band). The design strategy to achieve these properties is based on optimization of two air-hole diameters. Furthermore, the PCF has only five rings of air-holes to control dispersion and confinement loss. Furthermore, the validation of the proposed design is carried out by employing a 2-D FDFD with perfectly matched layers. Macro-bending loss performance of the designed PCF is also studied and it is found that the fiber shows low bending losses for the smallest feasible bending radius of 5 mm.