臺灣博碩士論文加值系統

本文藉由980nm雷射二極體光源及分別以無足型(Gaussian-apodized)光纖光柵與以超結構型(Superstructure)光纖光柵在摻鉺光纖兩端所形成的兩種光諧振腔來組成兩種可調式摻鉺光纖光柵雷射。本文針對均勻型光纖光柵及超結構型光纖光柵，以電腦模擬出兩者之反射光譜，並將該兩反射光譜之各自峰值波長視為分別具有以無足型光纖光柵及以超結構型光纖光柵所形成諧振腔之二雷射的輸出光波長。此外，並針對兩雷射的輸出光波長，模擬出該二光波長相對於應變之靈敏度，分別為1.2 與0.80 。實際所研製出之無足型光纖光柵雷射，其雷射光波長為1537.80nm，譜線寬為0.1nm，功率約為0.1mW，波長隨應變變動之可調諧範圍為0.9nm，及波長相對於應變之靈敏度為0.715 。至於所研製之超結構型光纖光柵雷射，其諧振腔是由具有兩個峰值反射波長之超結構光纖光柵在摻鉺光纖兩端所形成，該雷射可同時產生兩種不同波長的雷射光，波長分別為1550.840nm及1552.360nm，譜線寬均約為0.06nm，總功率約為0.63mW。此二雷射光波長隨應變變動的可調諧範圍，因應變變動時，二不同雷射光的功率會發生彼此相等、彼此互見高低及消失的現象，以致於可調諧範圍極窄，無法藉解析度有限(0.05nm)之光頻譜分析儀所顯示的光譜來準確求得；波長相對於應變之靈敏度，亦受限於光頻譜分析儀之解析度，而無法準確求得。

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.

1.前言……………………………………………………………1
1.1.概述……………………………………………………………1
1.2.研究動機………………………………………………………3
1.3.論文架構………………………………………………………4
2.摻鉺光纖光柵雷射原理………………………………………5
2.1.原理……………………………………………………………5
2.2.摻鉺光纖………………………………………………………5
2.3.光纖光柵式諧振腔……………………………………………7
2.3.1 均勻型光纖光柵………………………………………………8
2.3.2 非均勻型光纖光柵─超結構型光纖光柵……………………11
2.3.3 光纖光柵之應變靈敏度………………………………………19
3.實驗成果………………………………………………………21
3.1.簡介……………………………………………………………21
3.2.實驗架設………………………………………………………21
3.3.實驗方法及結果討論…………………………………………23
3.3.1 驅動及溫控電路………………………………………………23
3.3.2 980nm Pumping Laser………………………………………26
3.3.3 摻鉺光纖之ASE………………………………………………27
3.3.4 光纖光柵反射頻譜……………………………………………29
3.3.5 光纖光柵雷射…………………………………………………34
3.3.5.1 無足型光纖光柵雷射…………………………………………34
3.3.5.2 超結構型光纖光柵雷射………………………………………39
4.結論與建議……………………………………………………47
4.1 結論……………………………………………………………47
4.2 建議……………………………………………………………48
參考文獻…………………………………………………………………49
附錄A………………………………………………………………………51
附錄B………………………………………………………………………53

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