32×32光學能隙型波長交換器之研究

Abstract

本文提出利用絕緣層上矽晶並結合一維光學能隙共振型濾波器及二維光學能隙大角度轉折波導所組成之32×32光學能隙型波長交換器。在一維光學能隙共振型濾波器，我們利用一維光子晶體週期性結構及λ/4的相位移技術設計出高傳送功率、低插入損失及高品質因素的共振型濾波器。在二維光學能隙大角度轉折波導，我們利用二維光子晶體週期性結構及線狀缺陷的技術並針對不同的能隙結構來控制光在波導中行進的路徑，以便達到縮小積體光學元件之體積。 在32×32光學能隙型波長交換器，我們著重提出一有效的路由自動交換方式並結合光學能隙晶格及多模干涉區所組成之光學能隙型波長交換器，我們在多模干涉區上側摻雜如同光學能隙晶格型之週期排列的硼和磷離子，再利用電壓調變多模干涉區中光學能隙晶格型之雜質的濃度變化，利用雜質的變化來改變折射率，藉此從波導中取出特定信號，以達到可控制特定波長信號的路由路徑。接著，我們將此可調式32×32光學能隙型波長交換器應用於高密度分波多工的傳輸網路系統中，如此可達到充分利用有限的波長資源的目的。

In this thesis, we design a 32×32 photonic bandgap (PBG) wavelength switch which combines one-dimensional (1-D) resonant PBG filter waveguide and two-dimensional (2-D) PBG sharp bend waveguide based on silicon-on-insulator (SOI) wafer. In 1-D resonant PBG filter waveguide, we use the technique of PBG and phase shift to design a high transmittance, lower insertion loss and high quality factor resonant PBG filter waveguide. In 2-D PBG sharp bend waveguide, we use the technique of photonic bandgap and line defect to control the direction of the light wave propagation in a waveguide. In 32×32 PBG wavelength switch, we focus on the new technology of router. The 32×32 PBG wavelength switch which combines PBG structure and multimode interference (MMI) structure. The boron and phosphorus ions are assumed doping on the upper layer of PBG structure and adding voltage to change the carrier concentration distribution. By changing carrier concentration distribution, the index can be changed. We can switch the specific wavelength form the output port of waveguide. We could apply such a device into optical network using finite wavelength channel numbers.