本論文探討一L波帶光纖環型雷射，內容主要包含雷射光源的穩定度分析及半導體光放大器在此架構中的重要性，並且以此雷射進行25公里單模光纖的傳輸，以及注入法布里-比洛雷射二極體做直接調變效能量測。
首先，比較常用雷射與所研製光纖雷射的特性，然後，由實驗中探討半導體光放大器對光纖雷射的穩定影響，以及有無半導體光放大器的差異性。文中利用頻譜特性去說明雷射穩定的條件，之後得到一輸出光功率穩定且等化的波長可調式雷射光源。

此光纖雷射可調波長範圍為1575nm~1605nm，輸出功率大於-5.5dBm，背對背接的外調特性，明滅比為10.33~10.58dB，Q值範圍在10.23~11.75。此外，外調10Gbps NRZ PRBS信號以25公里單模光纖下行傳輸後的靈敏度為-19.5dBm ~ -19.8dBm。此外，注入法布里-比洛雷射二極體上行10公里單模光纖的靈敏度為-29.8dBm。

In this thesis, a study on the L-Band fiber ring laser is made. The main topics contains the analysis of light source stability and the roll of the semiconductor optical amplifier. Using this laser, a transmission of 25-km standard single-mode fiber and a direct modulation of the Fabry Perot Laser diode injection locked by our fiber laser are shown.
Firstly, characteristics of our fiber laser are compared with that of common lasers. Then, we discuss the influence of the use of a semiconductor optical amplifier, in our fiber structure, with the aid of the electrical spectrum characteristics of our fiber laser. Afterwards, a stable, tunable and equalization output power laser are demonstrated.
The tunable range of our laser is 1575nm~1605nm. The output power is more than -5.5dBm. The range of ER is 10.33~10.58dB, and the range of Q value is 10.23~11.75. Moreover, it is found that the transmission sensitivity is -19.5~ -19.8dBm for an external modulation 10Gbit/s NRZ signal and transmission 25-km single-mode fiber. Besides, the sensitivity is -29.8dBm for a upstream transmission by the injection-locked Fabry Perot laser diode and a transmission over 10-km single-mode fiber.

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