Analysis of the Confinement Loss and Birefringence of Index-Guided Photonic Crystal Fibres (PCF) in the Visible Spectrum Kumar Mukesh1, Kumar Manoj2 1M. Tech. Scholar, Department of Electronics & Communication Engineering, BRCM-CET, Bahal, India 2Assistant Professor, Department of Electronics & Communication Engineering, BRCM-CET, Bahal, India Online published on 31 October, 2017. Abstract This paper presents a comparative study of confinement ability of two 4-ring hexagonal lattice index-guided PCFs with different air-hole spacing (pitch) in the visible spectrum. From analysis and comparison of the two optimized PCF structures, it can be investigated that the confinement loss is very low in the structure designed with d/∧ =0.5 and ∧ =1.4μm, where the light is single mode and confined in the core for the visible region (400–700)nm. A low confinement loss and low birefringence of the order of 10−3 and 10−4 respectively are obtained for this PCF. Also the effective area is found to be nearly 2–3μm2 and nonlinearity coefficient as 198-82km −1w−1, extremely high confinement ability in the visible range and non-linearity makes it promising for non-linear and sensing applications. By doing comparative study we will try to show that the structure with higher pitch value (1.4μm) has got very low confinement loss of the order of 10−3. The numerical simulation result of proposed PCF will indicate that it has high power handling capability up to 0.34Gw/cm2 and a low Birefringence of the order of 10−4. This PCF has small effective area about 2–3μm2 in the visible spectrum and corresponding non-linearity co-efficient are obtained as 198-82km−1 w−1. Top Keywords Photonic crystal fiber(PCF), Confinement loss, effective refractive index, finite element method. Top |