PERFORMANCE ANALYSIS OF A HEXAGONAL PHOTONIC CRYSTAL FIBER(H-PCF) OVER A BROADBAND RANGE BY VARYING DOPING PARAMETERS

Abstract

This thesis paper presents a novel design of a hexagonal four ring photonic crystal fiber (H-PCF) and its performance for different parameter such as effective mode index, dispersion, effective mode area and non-linearity parameter. COMSOL Multi-physics 4.3 software is used to design and analyze the parameters of H-PCF. The designed H-PCF consists of four layered circular air holes and gradually decreasing refractive index from core to cladding. Doping materials, doping percentage and wavelength are varied to analyze the characteristics of the designed H-PCF. MATLAB 7.6 is used to plot the simulation results. The values of Dispersion, Effective mode index, Effective mode area and Non-linearity parameter are calculated from standard equations and plotted against the wavelength. Nearly flattened dispersion is found for a wide range of wavelength from 1410 nm to 1610 nm for GeO2 doped silica at 30% doping and for BaF2doped silica at 10% doping. An increasing effective mode index of value 1.4038 to 1.4401 is found by varying doping percentage of GeO2 doped silica and an increasing effective mode index of 1.4038 to 1.4087 is found by varying doping percentage of BaF2 doped silica which is important for light confinement and total internal reflection. The proposed H-PCF shows nearly zero dispersion and don’t display flattened range of dispersion when not doped. But when the model is doped with GeO2 and BaF2, then it offers flattened dispersion for a wide range of wavelength from 1410 nm to 1610 nm. Though the effective mode area of the model decreases with increasing doping percentage, but it is in the acceptable range of fiber optic communication. Increasing non-linear parameter from 14.31 W-1Km-1 to 27.98 W-1Km-1 can be found by varying doping percentage for GeO2 doping and from 13.5 W1Km-1 to 18.91 W-1Km-1 for BaF2 doping. When the loss parameters of the proposed HPCF are compared for both type of doping, it is found that for the same percentage of doping concentration, value of effective mode area is higher for BaF2 doped silica than GeO2 doped silica and nonlinearity parameter is higher for GeO2 doping than BaF2 doping. Increase of effective mode index is higher for GeO2 doping than BaF2 doping. In summary, it can be said that the proposed H-PCF displays good performance in terms of effective mode index, effective mode area, non-linear parameter, dispersion etc. with doping of GeO2 and BaF2, which is important for optical communication.