本論文旨為研究所提出之自混合光時域反射儀(self-mixing optical time domain reflectometry, SMOTDR)，並將其應用於光纖系統下 測距以及缺陷偵測。透過使用半導體雷射並追蹤由光回饋機制產生之動態行為的時間延遲特徵，我們提出一新穎之自混合光時域反射儀。自混合光時域反射儀同時具有架構輕巧、高測距解析度、高偵測靈敏性等優點。根據實驗結果顯示，其能達到2 cm 的測距解析度以及-32 dBm 的偵測靈敏性。並且由於架構上的改良，使得自混合光時域反射儀本身就存在於光纖系統中，使其有機會成為內建式的自我感測儀。另一方面我們也將自混合光時域反射儀與混沌相關光時域反射儀(chaotic correlation optical time domain reflectometry, CCOTDR) 進行比較，自混合光時域反射儀除了有架構更為簡潔以及簡化處理程序的優勢外，還具有較高的測距靈敏性，並且在長距離的測試下，由於架構上的差異，它的測距表現會更優於混沌相關光時域反射儀。

The objective of this study is to demonstrate a new technique for fiber ranging and fault locating. By using semiconductor laser and extracting the time delay signature (TDS) of dynamical states resulting from the optical feedback, we developed the selfmixing optical time domain reflectometry (SMOTDR). Experimental results show that 2 cm resolution and -32 dBm sensitivity had been achieved. And due to the improve of setup, SMOTDR has already existed in fiber system so it has the potential to become a built-in self-detector. On the other hand, we compare SMOTDR with chaotic correlation optical time domain reflectometry (CCOTDR), besides SMOTDR has the compacter setup and simplified processing program, moreover it has the higher ranging sensitivity, furthermore due to the difference on setup the ranging performance would be better than CCOTDR in long testing length.

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