| Summary: | 碩士 === 長庚大學 === 電機工程研究所 === 89 === The main body of this paper was with regard to the combination of two kinds of tunable erbium-doped fiber grating lasers by the 980nm laser diode light and the two kinds of optical cavities which were formed at the two sides of erbium-doped fiber separately by Gaussian-apodized and superstructure fiber grating. To focus on the uniform and superstructure fiber gratings, we used computer to simulate their reflection spectrums and regard the peak-wavelengths of these two reflection spectrums as two lasers' output wavelengths which separately have the optical cavity formed by Gaussian-apodized and superstructure fiber grating. Besides, focusing on the two lasers' output wavelengths, we also simulated the relative strain sensitivity of these two wavelengths and they were separately 1.2 and 0.8 . In facts, the apodized fiber grating laser have output wavelength was 1537.80, the linewidth was 0.1nm, the power was about 0.1mW, the wavelength tunable range according to strain was 0.9nm and the relative wavelength-strain sensitivity was 0.715 . As for the produced superstructure fiber grating laser, its optical cavity was formed by the superstructure fiber grating which has two peak-reflecting-wavelengths at the two sides of erbium-doped fiber. This laser can produce two beams of laser which have different wavelengths at the same time and the wavelengths were 1550.840nm and 1552.360nm, the linewidthes were both 0.06nm, and the total power was about 0.63mW.
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