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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65243

    Title: 電光非週期性晶疇極化反轉鈮酸鋰波導定向耦合元件之研究;Electro-Optically Switched Directional Couplers in Aperiodically Poled LiNbO3 Waveguides
    Authors: 簡采毅;Chien,Tsai-yi
    Contributors: 光電科學與工程學系
    Keywords: 定向耦合器;鈮酸鋰;Directional Coupler;APPLN
    Date: 2014-08-22
    Issue Date: 2014-10-15 14:44:37 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 在資訊量爆炸的時代,光通訊已逐漸取代原先的電子訊號傳輸,成為不可或缺的方法,但目前技術尚未發展成熟,任何有關於光傳輸、光訊號調變元件之研究,對於未來之發展將給予莫大的支持及幫助。
    ;In the era of information explosion, optical communication is desired to replace electronic transmission because of the increase of the data-carrying capacity nowadays; however, it is not mature enough. And therefore researches, which are related with optical transmission and optical signal modulation devices, such as directional couplers, would give great support in the future.
    The function of the optical directional coupler is not only the switch, the selective device of frequency and polarization, but also the amplitude divider. Moreover, the directional coupler, which is based on electro-optic (EO) crystal, can achieve a fast modulator by modulating the applied voltage.
    In this study, the electro-optically switched directional couplers in APPLN (aperiodically poled lithium niobate) were designed by the AOS (aperiodic optical superlattice) technique with the aid of the simulated annealing (SA) optimization method. The split ratio based on the design can be manipulated by applying voltage along the crystal z axis and performances, which are compared with the periodical designs in the previous literatures, can be even improved.
    The optimized APPLN structures can increase the tolerance for fabrication and working voltage, which allows the possibility of output performances being more flexible. Based on this advantage, we could further apply designs to practical applications, such as voltage circuit breaker, 1 × 4 signal router, integrated light source, and logic gates (NAND, AND, XOR, XNOR, NOR, OR). In the future, we expect to realize the optimized device to be a highly competitive device.
    Appears in Collections:[光電科學研究所] 博碩士論文

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