Effect of Dispersive Materials on the Dispersion and Normalized Frequency Characteristics of a Square Photonic Crystal Fiber

摘要

In this paper, a solid core photonic crystal fiber (PCF) with square lattice of air holes is proposed and numerically investigated. The air holes of the PCF are filled with metals which follow Drude-Lorentz model of dispersion. Chromatic dispersion and normalized frequency (V-eff) parameters are investigated using frequency domain algorithm based on semi-vectorial finite difference time domain (FDTD) method. The frequency range is chosen as 0.4 to 1.0 mu m for numerical computation of the square PCF to calculate the dispersion and V-eff. This frequency range is chosen since it almost includes visible light communication wavelength span (0.375-0.78 mu m) and also the metals that are applied in our PCF follow Drude-Lorentz condition in this range. High negative dispersion is observed when metals are applied in the cladding air holes of the PCF as compared to that of the PCF with cladding containing only air holes. In case of Aluminum as the metal we have got highest dispersion in the negative direction which is -44000 psm-km. The V-eff parameters obtained for PCF are also highest (similar to 160) in case of Aluminium applied to the cladding holes.