Design and simulation of highly nonlinear and low loss square Photonic Crystal Fiber

Here, we designed a highly nonlinear and low loss Photonic Crystal Fiber (PCF) structure with square lattice using COMSOL multiphysics. Propagation properties of proposed PCF has been analysed. The analysis has been carried out using finite element method. The proposed fiber obtained low confinement loss, minimum dispersion for wide range of wavelength. Results shows that the proposed PCF gives large negative dispersion for a wide range of wavelength and this makes it suitable for dispersion compensating applications and also it gives high nonlinear coefficient of 117 W^-1Km^-1. The square lattice PCF structure with elliptical holes is also designed and its birefringence property is compared with PCF with circular holes. Results shows that PCF with elliptical holes shows high birefringence as compared to other and such high birefringent PCF can be used for polarization maintaining applications.