| Summary: | 碩士 === 龍華科技大學 === 電機工程系碩士班 === 101 === In high-density optical integrated circuits, waveguide crossings are two straight waveguides crossing each other. In this thesis, the dielectric rod structure of two-dimensional photonic crystals with cubic lattice is used for design and analysis. Dielectric rods used for filters are introduced to form cavities within the waveguide crossing devices. The proposed cavity-type waveguide crossing devices are simulated and analyzed by numerical methods. By the results of simulations, we find that by changing the radii and distances of the filtering dielectric rods, the characteristics of the transmission spectrum of the filter is under controlled.
In this thesis, we proposed a novel cavity-type waveguide crossing device for two-dimensional photonic crystal by introducing dielectric-rod filters. By the simulation and analysis, the central frequency of transmission mode is controlled by the distance of the dielectric-rod filters. The full width at half maximum of the transmission mode is also controlled by the radii of the dielectric-rod filters. Therefore, the proposed cavity-type waveguide crossing has the advantages of easily controlling the central frequency and the full width at half maximum of the transmission mode. The results of this research show practical values for the optical integrated circuits in the future.
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