| Summary: | 碩士 === 國立臺北科技大學 === 光電技術研究所 === 91 === In order to achieve the output of direction coupler with cross state, traditional optical direction coupler is needed to control the coupler length which is equal to an odd multiple of the coupling length exactly. R. V. Schmidt reported the reversed direction coupler that can adjust coupling length through voltage tuning, even if the coupler length is not an odd multiple of the coupling length.
In this paper, we propose the performance of directional coupler which can be optimized by the variation of a number of design and fabrication parameters, such as diffusion depth, thickness of the titanium layer, waveguide width, waveguide gap and coupler length. In addition, we utilize several 2×2 reversed direction couplers to form 4×4 optical switch. Furthermore, we have demonstrated the crosstalk of 4×4 optical switch can be reduced to —50dB by two independence electrode voltages.
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