Abstract
In this paper, using Plane Wave Expansion (PWE) and Finite Difference Time Domain (FDTD) methods, an all optical add-drop filter (ADF) is designed and simulated. It has two defect waveguides (BUS and DROP) and a square ring resonator in-between. The structure consists of a square lattice of infinitely long dielectric circular rods of refractive index 3.59 embedded in air. The total footprint of the proposed structure is merely 323μm2. The backward dropping efficiency of the designed ADF is 97% at wavelength 1554nm, with transmission efficiency and quality factor equal to 100% and 444 respectively. The effect of variation of lattice constant (a), Radius of the rods (r), and Refractive index (n) on the performance of the ADF are also investigated. As the resonant wavelength of the ring resonator can be manipulated by manipulating the parameters of the circular rods, the proposed ADF can be set to function at desired frequencies.
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