A novel design of photonic crystal fiber with ultra-flattened dispersion and ultra-low loss

A novel photonic crystal fiber (PCF) structure with triangular core is proposed. The PCF has ultra-flattened dispersion and negligible loss characteristics throughout the telecommunication windows (1.2 mum to 1.7 mum ). The design strategy to achieve these properties is based on optimization of three air-hole diameters. Furthermore, the PCF has only seven rings of air-holes to control loss. The validation of the proposed design is carried out by employing a 2-D FDTD with perfectly matched layers. Macro-bending loss performance of the designed PCF is also studied. It is found that the fiber shows low bending losses for the smallest feasible bending radius of 5 mm.