抗諧振反射光波導偏極化分光元件

Abstract

在本論文中,我們提出三種不同結構的抗諧振反射光波導偏極化分光元件, 其中,我們利用數種抗諧振反射光波導及/或 B 型抗諧振反射光波導的特 性來得到偏極化光分離的要求.這個元件都符合良好的極化區別,即其串 音(crosstalk) 皆小於 -20 dB.在元件分析方面,我們使用轉換矩陣法( Transfer Matrix Method)分析波導的模態特性,並利用本徵模函數展開 法(Eigenmode Expansion Method)分析元件外側包蓋層為逐漸縮減結構時 各個模態之間的耦合行為. 最後, 使用波束傳播法(Beam Propagation Method)驗證所述的元件特性. Three different configurations of ARROW-based polarization beam splitters are presented, the polarization splitting is attained by utilizing various characteristics of basic ARROW and/or ARROW-B. All these proposed devices perform good polarization discrimination, that is, with crosstalk < -20 dB.In analyzing and designing our devices, we employ multilayer stack theory to derive the modal charateristics of the waveguides, and employ eigenmode expansion method to observe coupling behavior between local normal modes in a taper structure. Beam propagation method has been employed to simulate the lightwave behavior in the devices, and the simulation results are congruous with the theoritical analysis.