| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === This thesis is consist of four parts: the first part is the amplification theorem of erbium doped fiber amplifier (EDFA), the second part is the analysis of EDF fiber laser, then we introduce high-efficiency C-Band tunable fiber laser including the forward/backward circulator-based fiber laser, and forward/backward broadband mirror-based fiber laser schemes. In the four structures, 50 mW pumping power and 4 m EDF are adopted. For the data measurement, the lasing power are 6.12, 7.24, 9.27, and 9.98 mW, side mode suppression ratio (SMSR) are 53.65, 53.46, 54.9, and 54.47 dB, transfer efficiency are 14.01, 16.42, 20.46, and 21.93 %, 3 dB bandwidth are 0.06, 0.06, 0.051, and 0.05 nm respectively. The third part is to introduce a conventional resonator fiber laser and an improved structure. As 20 mW pumping power and 4 m EDF are adopted in these two configurations, the lasing power are 2.1, 2.78 mW, SMSR are 61.2 and 5.89 dB, transfer efficiency are 13.92 and 18.29 %, 3dB bandwidth are both 0.06 nm. Finally, we introduce the L-Band linear-cavity fiber laser structure, including the forward/backward circulator-based fiber laser and forward/backward broadband mirror-based fiber laser structures. In these four structures, 50 mW pumping power and 15 m EDF are adopted. For these four configurations, the lasing power are 3.86, 4.23, 4.63, and 4.72mW, SMSR are 50.08, 51.02, 51.26, and 51.33 dB, transfer efficiency are 10.36, 11.24, 12.2, and 12.36 %, 3 dB bandwidth are 0.052, 0.051, 0.05, and 0.05 nm, respectively. These kinds of fiber lasers we proposed here are all with merit of efficiency improvement. They could find many applications in fiber sensing system to increase the dynamic range, or transmitter technology to reduce the required pumping power.
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