對於摻鉺光纖放大器來說，必須藉由增加雷射與光纖的耦光效率和提高雷射功率來增進其效能，雖然已經有許多高耦光效率的方式被提出，耦光效率甚至可達90%以上，但是由於高功率雷射隨著功率越高，因其光場特性，功率到達某一程度將無法再適用於這些高耦光效率的架構，利用多段串接式光纖可以再增加與高功率雷射耦光時的耦光效率，使其在高功率雷射下仍然保有高耦光效率的特性。
所謂多段光纖即單模光纖與多模光纖接續在一起，多段光纖雖然具有增加高功率雷射耦光效率的優點，但在製作多段光纖時卻因為熔接面的檢測誤差造成多段光纖在製作上會有5%∼10%的耦光損失，我們使用CCD來觀察多段光纖的熔接面，藉由搭配特殊光源的方式來做檢測，成功克服狹小空間自動化製作多段串接式光纖的困難，達到減少製作多段光纖的耦光損失。

To get better EDFA performance, we have to improve the coupling efficiency of semiconductor laser diode(LD) and fiber optic; also, increase the LD’s power to achieve. There are plenty of ways to have higher coupling efficiency out there. Some of them even can reach 90% or better coupling efficiency. However, because of light field property, high-power LD output will not be able to apply to high coupling efficiency structure. Therefore, using cascaded fiber can improve coupling efficiency and maintain its characteristic in high-power laser output environment.

Cascaded fiber is connecting SMF and GIF together. Although cascaded fiber can increase high-power LD output of coupling efficiency, it has 5% to 10% of loss during manufacture because of the inspect error of melting surface. We use CCD to observe the cascaded fiber’s melting surface. Then, we pair with special light source to do the examination. Thus, we can overcome the obstacle, do automatically manufacture of the cascaded fiber in a small area, and reduce the coupling loss of cascaded fiber.

1 序論..........................2
1.1 簡介........................5
1.2 熔接面檢測精度的重要性......6
1.3 研究動機與目的..............9
2 光纖的檢測方式...............10
3 熔接面檢測系統設計...........12
3.1 熔接面的檢測方法...........12
3.2 平行光轉換方式.............18
3.3 光纖載具...................19
4 實驗.........................22
4.1 系統架構...................22
4.2 檢測結果...................24
5 結論.........................26

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