本論文著重於三種形式的直調環型光纖雷射，分別利用直調法布里－比洛雷射、直調反射式半導體放大器、以及掺鉺光纖與直調半導體放大器。首先，本文分析環型光纖雷射以反射式半導體放大器與直調法布里－比洛雷射所組合成之短距離傳輸雷射，加入掺鉺光纖放大器提高輸出功率，傳輸較長距離的雷射，此光纖雷射可調波長範圍為1535nm~1580nm，輸出光功率大於0dBm。雷射直接調變1.25Gb/s NRZ碼27-1虛擬隨機序號之特性：明滅比約為9dB，Q值約為10。
　　接著，本文探討直調環型光纖雷射於雙向雙線存取光網路之應用，利用直調環型光纖雷射注入鎖模法布里－比洛雷射二極體技術，直調環型光纖雷射提供下行訊號給用戶端，且下行光再被利用來注入法布里－比洛雷射，再直調法布里－比洛雷射做為上行光訊號。實驗顯示可注入的波長範圍為1538nm至1550nm，SMSR約為39dB；上下行訊號調變皆為1.25Gb/s NRZ碼27-1虛擬隨機序號，同時分別傳輸25公里單模光纖。上下行傳輸後，下行的Q值為7.31與ER為9.03dB，上行的Q值為8.9與ER為9.14dB。上下行的靈敏度各為-29.84dBm和-27.80dBm，而功率償付值皆小於1dB。

In this thesis, a study is presented of three types of directly modulated fiber ring laser by using Fabry–Pérot laser diode (FP-LD), reflective semiconductor optical amplifier (RSOA), erbium-doped fiber amplifier (EDFA) and optical tunable filter (OTF). Firstly, A short-distance transmission is demonstrated using RSOA on ring laser. The tunable range of laser wavelength is 1535nm~1580nm. The output power is above 0dBm. The ER is 9dB, and the Q value is 10 for a directly modulation 1.25Gb/s NRZ signal.
Next, the direct modulated fiber ring laser is applied to injection-locked FP-LD for a bidirectional transmission. The laser not only generates downstream data but also serves as the injection light source for upstream FP-LD. The tunable range of injected-locked laser wavelength is 1538nm~1550nm, and SMSR is about 39dB. For 1.25Gb/s downstream and upstream transmissions over 25-km single mode fiber, power penalties is below 1dB, the bidirectional transmission sensitivities are of -29.84dBm and -27.80dBm for upstream and downstream transmission, respectively. After transmissions over 25-km single mode fiber, the ERs are about 9 dB, and the Q values are 8.9 and 7.3 for upstream and downstream transmission, respectively.

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