本篇論文主要分為兩個部份，第一部份針對新型光網路架構-動態波長配置設計保護機制，在增加最少光纖路徑的考量下建構即時的保護線路。設計的基本想法是將遠端節點加上一個被動的分光元件用來將遠端節點串聯來形成一個環形網路，以這個環形網路來做為保護線路，提供網路意外斷訊時的另一條路徑。設計架構有三種，在遠端節點所使用的被動元件分別是寬頻譜濾波器、塞取多功器、分光器。每一個皆有其優缺點，我們對這些架構進行分析與討論作為以後改進的方向。
第二部份設計低成本的新型光網路監控系統，在光線路終點端以單一可調式雷射發送頻率調變訊號同時傳送至各個光網路單元，在光網路單元則放置不同自由頻譜範圍的反射式干涉元件，藉由不同自由頻譜範圍的干涉元件將調變訊號干涉後反射回光線路終點端，由於每個反射的干涉訊號接為互相正交的旋波訊號，而且我們可以經由簡單的計算得知此頻率大小。實際應用上，只要將光訊號轉換為電訊號後以頻譜分析儀量測就可以監控每個光網路單元的線路狀況。

This thesis includes two major topics. First, we design novel protection structures for dynamic wavelength allocation (DWA) of passive optical networks (PONs). We evaluate these structures base on the consideration for using the shortest extra fiber length. The basic concept is to use passive optical components to connect remote nodes to form a ring topology, and use the ring as protection path. We design three kinds of protection structures for DWA PON. The passive optical components that used in a romote node (RN) are broadband filter, optical add/drop multiplexer (OADM), and 1×2 coupler, respectively. We analyze these structures and discuss how to improve the protection system in the future.
Second, we propose a low-cost optical monitoring system which uses a tunable laser to transmit a frequency modulated signal to optical network units (ONUs). Each ONU has a different reflective interference device which has different free spectrum range (FSR). The reflective signals from each ONU are orthogonal to each other and almost sinusoidal. After Fourier transformation, these frequencies can be used to monitor the condition of each ONU. In the practical application, we can monitor the PON by using a frequency analyzer.

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