本論文發明了一種新微型高效率雙模干涉分波多工(Two-mode-interference wavelength division multiplexing, TMI WDM)的方法並成功建立其理論模型。其工作原理是利用光子晶體能隙(Photonic band gap, PBG)邊緣的高色散特性，將 PBG 邊緣的波長在很短的距離內分開。元件的設計、模擬與效能分析是使用二維的有限差分時域法(Finite difference time domain, FDTD)。經過設計，具有高色散性光柵結構的雙模波導管會產生一個中心波長落在1550nm並與模態相依的光子能隙。位於光子能隙邊緣的兩個波長，具有最低的反射損耗和最高的色散性，故被選擇以進行分波驗證。結果顯示此二波長的耦合長度(分波距離)因光子能隙的高色散性影響可明顯縮短。能量強度對比差異可達20dB 以上，嵌入損耗只有0.8 dB。

In this dissertation, a novel technique of two-mode-interference wavelength-division multiplexing (TMI WDM) for 1.55-μm operation using highly dispersive photonic band gap was first proposed. The WDM devices were verified using the finite-difference time-domain (FDTD) method. A two-moded waveguide assisted with a dispersive grating provided a mode-dependent reflection band of central wavelength at 1.55μm. The wavelengths at the PBG edges were selected for wavelength multiplexing for their low reflection losses and high dispersive properties. The results showed that the wavelengths can be separated in much shorter coupler lengths than those using regular waveguide coupling. The insertion loss of 0.8 dB and the isolation contrast above 20dB could be achieved.

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Chapter5
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