本論文致力於分波多工被動光網路之即時監控技術，論文內容可分五章；第一章為緒論及論文架構；第二章為基本概念論述，簡介現存之網路架構及實驗元件設備；第三章為傳統雙向分波多工式被動光網路之監控，開始以系統分析來考量各監控元件之參數；而後實驗一的習知架構我們可以即時的檢知光路存活，但發生斷點時並無法確切得知斷路位置；實驗二加入了特定比例耦合器及一具波長選擇性之光時域反射儀以改善習知架構之缺點，在局端監控信號之信雜比高達5 dB，功率償付值小於0.2 dB；其後提出了兩個針對成本及光時域反射儀使用壽命所做的改良架構；第四章針對使用光迴旋器實現上行之分波多工被動光網路架構進行光路監測，在實驗一使用分波多工耦合器將監控信號及傳輸信號分離，使經反射器反射的監控光源重新回到局端達到監控的目的，但此架構存在著監控之盲點，原因在於監控信號與傳輸信號本身不在同一路徑傳輸；本章實驗二使用一個特殊的光迴旋器、一個分波多工耦合器及光纖鏡面改善實驗一的監控盲點，使傳輸信號與監控信號在同一路徑傳輸；改善架構使用了2 x 2光開關切換光頻譜分析儀、光時域反射儀及上下行路徑，雖然並無法達到完全即時的監控，但在合理的量測時間內，此架構對成本的考量非常有利；第五章則為本論文的結論與未來展望。

This thesis focuses on in-service WDM-PON monitoring and includes five Chapters. Chapter 1 is an overview and description of thesis structure. After introduce of the concept and key components/devices using in WDM-PON in Chapter 2, In Chapter 3, we take a conventional bidirectional WDM-PON configuration as an example to study. Then we analyze every monitoring parameter in such a system. We find that in the conventional experiment, we could trace which fiber branch is broken, but are unable to confirm where the precise broken distance is. Thus, we try to overcome this drawback by adding a ratio coupler and wavelength-tunable optical time domain reflector (OTDR). The monitoring signals SNR obtained in the central office (CO) is about 5 dB and power penalty is less than 0.2 dB during the monitoring period. In the following chapter, we introduce an optical path monitoring method in a WDM-PON configuration. In experiment 1, we use C/L band WDM pair to divide monitoring and transmission signals, the monitoring signals could be reflected to the CO by the help of an optical circulator (OC). A blind spot may arise in such configuration if the monitoring and transmission signals are not propagate in the same path. In experiment 2, we use a special OC, a C/L band WDM and a fiber mirror to solve this problem as mentioned in experiment 1. So, the monitoring and transmission signals are transmitted in the same path as predicted. In this modified architecture, a 2 2 optical switch (OSW) is used to select either the optical spectrum analyzer (OSA) and OTDR pair for monitoring the upstream or downstream signals. The configuration has the merit of cost effective. Finally, a brief conclusion and suggested future work will be given.

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