Design and analysis of 2-D hexagonal photonic crystal structure based channel drop filter for CWDM system

In this paper, the design & analysis of two dimensional (2-D) photonic crystal structure based channel drop filter is investigated using photonic crystal ring resonator. In this paper, Photonic Crystal (PhC) based on hexagonal lattice periodic arrays of Gallium Arsenide (GaAs) rods in air structure have been investigated using Finite Difference Time Domain (FDTD) method and photonic band gap is being calculated using Plane Wave Expansion (PWE) method. The PhC designs have been optimized for telecommunication wavelength λ= 1511 nm. The number of rods in X and Z directions are 19 and 23, with lattice constant 0.540 nm it illustrates that the arrangement of Gallium Arsenide (GaAs) rods in the structure which gives the overall size of the device around 10.26 μm × 12.42 μm. The designed filter gives good dropping efficiency using 3.40, refractive index. The designed structure is useful for CWDM systems. This device may serve as a key component in photonic integrated circuits, optical communication networks and metro applications. The device is ultra compact with the overall size around 127 μm2.