Design of a New Narrow Band Channel dro‎p Filter Based on a Photonic Crystal Ring Resonator

In this paper a novel structure for narrow band Channel drop Filter (CDF) using 2D photonic crystal with a square lattice based on ring resonator is proposed. In this design, an optical ring resonator is embedded between two Horizontal input and output waveguides with 4 orbitals around the center of the resonator so that each orbital consists of 8 rods in which the radius of larger orbital rods is bigger than the radius of smaller orbital rods. The analysis of simulation results showed the proposed filter has the transmission efficiency of 100% at the resonance wavelength of 1550 nm, bandwidth and quality factor are 0.2 and 7753, respectively. This proves that it is a suitable filter for optical communication applications. Ultra-low bandwidth and high transmission efficiency are the most important advantages of the proposed filter in this study. Therefore, it is proved that this filter is usable and suitable for optical communication applications.