本文探討直調式可調雙波長環型光纖雷射之研製，架構中的主要組件為反射式半導體光放大器與兩個光濾波器。波長可調範圍包含C與L波段，寬度為45 nm（1535 nm~1580 nm），輸出光功率可達0 dBm。　　
　　首先，探討短距離直接調變傳輸，利用反射式半導體光放大器可直接調變訊號的特性，直調1.25Gbps、27-1虛擬隨機序列NRZ碼後進行傳輸測試，其背對背條件下的明滅比為7.61 dB，Q值為7.23。傳輸經1公里單模光纖後，明滅比為6.91 dB，Q值為6.94；傳輸1公里多模光纖後，明滅比為6.43 dB，Q值為6.12，雖傳輸距離短，但可供社區或山區應用。
　　其次，本文以調變數位電視訊號加到環型雷射中作傳輸接收測試，所得訊號品質最高可達78%，訊號強度保持在74%，此結果可讓使用者正常收看。
　　最後，為增加傳輸距離，我們採用注入鎖模技術，利用直調式可調雙波長環型雷射注入法布里-比洛雷射中，建立一個雙線雙向光網路。實驗中讓C波段的下行光注入法布里-比洛雷射進行鎖模，鎖模後的旁模抑制比可達42 dB，以直調1.25Gbps、27-1虛擬隨機序列NRZ碼同時進行上下行傳輸。L波段下行光經傳輸1公里單模光纖後，明滅比為6.82 dB、Q值為6.10、靈敏度為-30.62 dBm；C波段之法布里-比洛雷射上行光傳輸25公里後，明滅比為7.94 dB為8.12、靈敏度則為-29.38 dBm，上下行的功率補償皆小於1 dB。

This thesis presents a directly-modulated dual wavelength tunable fiber ring laser using reflective semiconductor optical amplifier (RSOA) and two optical filters (OTF). The tunable wavelength range is over 45 nm, including C band and L band. It’s output power can reach 0 dBm.
Firstly, a short-distance direct transmission is shown. When it is directly modulated with an 1.25Gbps NRZ signal through the RSOA, the extinction ratio (ER) and the Q values in a back-to-back transmission are 7.61 dB and 7.23, respectively. After transmitting over an 1-km single mode fiber(SMF), ER and Q values become 6.91 dB and 6.94,respectively. After transmitting over an 1-km multimode fiber (MMF), ER and Q values become 6.43 dB and 6.12, respectively.
Next, our fiber ring laser is directly modulated with a digital video broadcasting-terrestrial (DVB-T) signal. In a back-to-back transmission, the signal quality and the signal intensity are good and can reach 78% and 74%, respectively.
Finally, we apply our fiber ring laser to injection-locked Fabry- Perot laser diode (FP-LD) for a bidirectional transmission test. We use a C band laser source as the injection light source on the FP-LD for upstream transmission. After injection locking, the side mode suppression ratio (SMSR) can reach 42dB. Then, directly modulated 1.25Gbps NRZ signals are used in both RSOA and FP-LD for downstream and upstream transmissions. For the L-band downstream transmission over an 1-km SMF, the ER and Q values are 6.82 and 6.10, respectively. Its sensitivity is -30.62 dBm. For the C-band upstream transmission over a 25-km SMF, the ER and Q values are 7.94 and 8.12, respectively. Its sensitivity is -29.38 dBm. The power penalty is less than 1 dBm for both the downstream and upstream transmissions.

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