應用全像光學元件於光通信網路

Abstract

本論文提出以基片傳輸型全像元件取代傳統的稜鏡元件，作為偏極分光之 用。這種全像元件有一些良好的特性，諸如緊密、輕小及靈活等。因此我 們將這元件應用在各種光通信網路上，以提供系統改進之道。以這種基片 型全像片來建構班尼氏 (Benes)分域網路的方法會在文中闡述。運用此全 像元件的特性，網路內各交換單元間的固定連線可全部消除。我們也探討 了這些光學連線網路的一些性質，譬如交換單元可使用的連線型態與網路 容量、串音比等之關係。另外，這種基片型全像片也可組成被動式星形耦 合器，其中與光偏極性相關和無關的兩種都有介紹。最後，我們使用這元 件來組成緊密的、偏極無關的光交換器，並將它應用在同步光纖網路的自 動復原環；而此環形網路對元件特性的要求也會討論。 Compact, lightweight, and flexible substrate-mode holograms are presented to replace conventional prisms for polarization beamsplitting. These holographic optical elements are applied to various optical communication networks for system improvement. The approaches to implement Benes space-division networks with our substrate-mode holograms will be illustrated. The unique features of these holographic elements eliminate the need of interconnection lines between switching units. The characteristics of these optical interconnection networks are also discussed. Besides, the substrate-mode holograms are used to build N-by-N passive star couplers. Both polarization- dependent and polarization-independent star couplers are presented. The compact polarization-independent 1-by-2 and 2-by-2 optical switches using holograms are also proposed and their application to SONET self-healing rings is demonstrated and discussed.