| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 96 === This thesis aims to study the characteristic of L-band (1560-1610nm). Firstly we reviewed the theory of fiber bragg grating, fabrication, and demonstrated a tunable fiber laser of range from 1572nm to 1602nm that covers the entire L-band. Then the laser and EDF principals are reviewed as well. Secondly, various pumping power and three kinds of EDF lengths of three FBG wavelengths are experimented with in four laser cavity configurations. A fiber laser at 1572 nm with 7.28 mW output power is shown. It has an optical line width of 0.05nm, side mode suppression ratio (SMSR) of 56dB and power transfer efficiency of 7%. Another fiber laser with 9.51mW output power is shown with optical line width of 0.05 nm, SMSR of 59.8 at wavelength 1582nm and power transfer efficiency of 10%. Finally with the improvement of the coupling efficiency, the lasing output power becomes 12.13mW, SMSR is 60.4 dB, power transfer efficiency is 14.1%, and 3 dB bandwidth is 0.05nm at 1596nm. These results make this L-band fiber laser a good candidate for a wide variety of sensors and communication applications.
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