本論文旨在優化線性型光纖雷射的縱模抑制效果，分別以光纖迴路反射鏡或法拉第旋轉鏡配合光纖光柵當作共振之兩個端面，組成兩種不同結構的光纖雷射；首先從光纖雷射的泵激光源方向開始討論，實驗中採用後向式的泵激架構因為其擁有比前向式的泵激架構還好之模態穩定度和斜線效率。實驗中使用吸收係數為18.79 dB/m@1530 nm，長度為3 m的摻鉺光纖當作增益介質；之後將加入額外兩種不同的模態抑制架構，分別為環型子共振腔和摻鉺光纖吸收體，討論兩種光纖雷射架構的模態頻譜，經由實驗發現，在法拉第旋轉鏡式光纖雷射架構下，使用0.5 m或0.3 m的環型子共振腔分別可發現自由頻譜範圍約428 MHz及714 MHz，而當使用0.17 m的環型子共振腔時其自由頻譜範圍約為1.26GHz，則可以得到單縱模光纖雷射輸出；在另一方面，加入長度為0.5 m，吸收係數較低之摻鉺光纖吸收體到法拉第旋轉鏡式光纖雷射架構中，即可以有單縱模光纖雷射輸出且有高輸出功率。最後，將一個波長可調光纖光柵與法拉第旋轉鏡組成共振腔，配合兩種模態抑制架構，使其光纖雷射波長可以移動14 nm，並且在整個變動波段皆為單縱模光纖雷射的輸出。

The thesis investigates and optimizes single-longitudinal-mode (SLM) linear cavity erbium-doped fiber lasers (EDFLs). Two fiber lasers based on different cavity-end schemes are presented. There are fiber loop mirror (FLM) integrated fiber Bragg grating (FBG), and Faraday rotator mirror (FRM) integrated FBG. During experiment, backward pumping method is adopted as it has better characteristics in mode stability and slope efficiency than those of forward pumping method. During experiment, absorption coefficient of 18.79 dB/m@1530 nm for gain medium is used to obtain high output power and good signal-to-noise ratio. Consequently, we add either sub-ring cavity (SRC) or absorber as mode-suppressed element into the fiber laser cavity. We find that the FRM-based fiber laser could generate free spectral range (FSR) of 428 MHz and 714 MHz using 0.5-cm and 0.3-cm length SRCs, respectively. Furthermore, SLM fiber laser was obtained using 0.17 m SRC in a FSR of 1.26 GHz. On the other hand, by putting 0.5 m EDF of low absorption coefficient into FRM based fiber laser, SLM operation fiber laser could obtain with high output power. Finally, SLM wavelength-tunable fiber lasers are demonstrated by integration Faraday rotator mirror (FRM) with wavelength-tunable FBG. The laser span range is 14 nm using single FBG. SLM operation may be realized in the whole span range both for FRM-based and FLM-based fiber lasers.

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