Design and simulation of 3-channel drop filter by using 2D-Photonic Crystal Ring Resonator for ITU-T G.694.2 CWDM system

Abstract

In this paper, heterostructure based Channel Drop Filter (CDF) is designed. Wavelength Division Multiplexing systems using Two Dimensional (2D) Photonic Crystal Ring Resonator (PCRR) which is essential for Photonic Integrated Circuits (PICs) and future optical networks. The structure is devised in 2D square lattice which contains circular and elliptical Si rods in air host. The designed channel drop filter comprises three regions of ring resonator, in which region1 (having refractive index 3.255), region2 (having refractive index 3.32), and region 3 (having refractive index 3.47) are made up of circular Si rods that can be used to drop three channels centered at 1471 nm, 1491 nm and 1511 nm. Using 2D Finite Difference Time Domain (2D FDTD) method, the properties of the filter such as coupling, resonant wavelength are theoretically investigated. The Photonic Band Gap (PBG) of the designed structure is calculated by Plane Wave Expansion (PWE) method.