Design and analysis of optical filter for optical communication networks using photonics technology

In this paper, we propose Two Dimensional Photonic Crystal (2DPC) square lattice structure to design Channel Drop Filter (CDF) for optical communication networks. The proposed filter is designed using dual curved Photonic Crystal Ring Resonator (PCRR). The Photonic Band Gap (PBG) is calculated by Plane Wave Expansion (PWE) method. The 2DPC square lattice periodic arrays of dielectric rods have been investigated by Finite Difference Time Domain (FDTD) method. The number of rods in Z and X directions are 21 and 20, respectively with lattice constant a = 0.540 µm and rod radius r = 0.1 µm. The Filter has been optimized for telecommunication wavelengths λ = 1.551 µm with refractive indices 3.31 of materials Al0.4Ga0.6As. Further, the investigation is extended for study the effect of scattering rods radius, which leads to shift of resonant wavelength. The proposed structure is useful for CWDM optical communication systems and photonic integrated circuits which is ultra-compact device.