A Low Crosstalk Photonic Crystal-Based Optical Binary Divider with Ring Resonator Structure for DWDM Communication Systems

In this paper, we utilize a photonic crystal ring resonator structure to design a 2-channel optical wavelength binary divider. By the artificial intelligence method, the amounts of physical parameters of the photonic crystal structure are selected, such as refractive indices, radii, and so on. It has been demonstrated that wavelength separation is possible using photonic crystal ring resonators. To choose two channels with different central wavelengths, we employed two resonant rings with different structural parameters. The platform used for designing the proposed binary divider is a square lattice of dielectric rods immersed in air. The proposed binary divider has two channels with central wavelengths equal to λ₁ = 1573.7 nm and λ₂ = 1575.5 nm. The transmission efficiency of this binary decoder structure exceeds 98%. The quality factors for the first and second channels are 3934 and 5251, respectively. The total footprint of the structure is 263.5 μm²; therefore, the proposed structure has good potential for use in all-optical integrated circuits and wavelength multiplexing applications. Also, the crosstalk phenomenon between the channels is low.