本篇論文主要分為兩個部份，第一部分為光纖網路監控架構，對樹狀架構的光纖接取網路而言，由於其網路拓樸的特性，並無法使用傳統的光時域分析儀找出斷路分支。為了使光纖網路能維持好的服務品質，必須利用簡單且可靠的監測系統來確保其運作。此監控方式適用在樹枝狀結構的分時多工被動網路，我們在機房端發送一個調頻光訊號，該訊號透過光纖網路發送到每個用戶端。用以監控之反射式元件則放置在用戶端，藉由機房端發送的調頻光訊號產生干涉，在機房端能觀測到其干涉頻譜。
第二部份為光纖網路進水監控系統，我們利用低成本的材料製作感測器，並應用在不同光纖網路架構上，找到能提供最多感測器數量之環形架構。並實驗證明環形架構和魔晶土感測器能實際應用在進水監控系統，判斷出進水的發生，監控光纖線路的狀況。

This thesis includes two major topics. The first topic is related to an optical network monitoring detection system. In tree-type fiber-optic access networks, a traditional optical time-domain reflectometer is unable to distinguish the fault branch because of the network topology. In order to maintain service quality in fiber-optic networks, an easily-operated and reliable monitoring system is necessary. Therefore, we propose a new monitoring scheme that employs a continuous wavelength sweeper at the OLT and an interferometric (IF) device at each ONU. The OLT sends a frequency-modulated signal and then the IF devices reflect the interference signal to the OLT. The reflected signal from each ONU can easily be distinguished from the others by performing a Fourier transform. The corresponding spectral component will disappear if one of the distribution fiber is broken.
The second topic is related to an optical network immerse detection system. We propose a low-cost sensor for immerse detection. We discuss different link structures, and find out that the ring-type structure can support a greater number of nodes. We experimentally demonstrate that the immerse detection can function well by using the ring-type link structure and magic soil sensor.

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