| Summary: | 碩士 === 國立高雄應用科技大學 === 電子與資訊工程研究所碩士班 === 96 === In this thesis, it discussed the application of wavelength division multiplexers and all-optical logic gates of flip-flop in the photonic crystals. A photonic crystal is a revolutionary class of artificially periodic electromagnetic media, in which a fundamentally new electromagnetic phenomenon can be achieved. A photonic band gap defines a range of frequencies for which light is forbidden to exist inside the crystal. In such beam-splitter, the optical field is confined, horizontally, by a photonic band gap (PBG) provided by the photonic crystal. By using plane-wave expansion method and finite-difference time-domain method to analyzed photonic crystal beam-splitter structure.
Firstly, we cascade multimode interference and Mach-Zehnder interference waveguides to design all-optical logic devices. And then, using the two waveguides’ effect by varying the size of the airholes of the splitting structure, we present that the bending and controllable splitting of self-collimated beams can be useful in one-to-three beam splitter based on photonic crystals. Then, we have proposed an X structure of wavelength division multiplexer. It can be used in Fiber to the home communication system. Final, the resonator device of 5 x 5 super cell was proposed. It can apply to CWDM communication system which was defined by ITU-T Recommendation G.694.2. The advantages were in terms of compactness, easy manufacturing, simple structure, and high drop filter efficiency. In addition, we proposed a seven-channel visible wavelength division multiplexing system for the rainbow, it could be use to substitute for the superprism.
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