臺灣博碩士論文加值系統

隨著頻寬日益漸增的需求，具有高可靠度的光電元件被期許能提供不中斷的服務來處理各種訊號的連結。利用光訊號來傳遞訊息的光通訊系統中，包含將電轉換成光訊號的雷射二極體傳輸模組、在遠距離的傳送中將訊號放大的放大模組與能將光轉回電訊號的光電二極體接收模組。在這些光電轉換的過程中，各模組中的耦光效率扮演極著為重要的角色，它是通訊品質好壞重要的因素。以傳輸模組而言，耦光效率是指雷射二極體打出的光耦入光纖中的比率。所以，光纖必須盡可能的對準雷射二極體以確保得到高的耦光效率。
在高頻的光電模組中引線式雙排線型與蝶式型的盒式構裝最廣為使用。在盒式構裝中的引線式尾端是由末端鍍金的光纖錫焊在套管中所形成，再由雷射焊接接和在雷射二極體前。不論光纖被固定在套管中何處，都會先動態搜尋出具有最高耦光效率的位置，套管再被焊接在雷射模組上。但過去研究指出溫度循環測試後，焊錫中殘留應力重新分佈與潛變現象會將光纖推向套管的幾何中心，而這微小的位移對耦光效率有顯著的影響。這現象隨著光纖與套管的偏心量增加而更嚴重。一個減少雷射模組中耦光位置偏移的最佳方法是將光纖錫焊時固定在套管的幾何中心。
本篇論文發展出一套可以自動構裝引線式元件的系統，光纖將被錫焊在套管中心附近，偏心量可少於20μm。而這方法是使用一般文獻中CCD作為位置迴授裝置的基本架構下，提出無法達到精度要求的主要誤差源分析與補償方法。這篇論文的最後結果平均偏移量由以往的80μm改善到。根據過去研究資料顯示這樣得偏移量可以在溫度循環測試後讓耦光效率還保持在90%以上。未來工作是繼續補償更小的誤差源，以獲得更小的偏移量。

With ever-increasing demands for high-speed data transmission and device capacity to handle various telecommunication data links, the high reliability of these transmission devices is expected for uninterrupted service. A typical optical communication system consists of transmitters in which laser diodes convert electrical signals into light signals, optical fibers with a few pumps transmitting and maintaining these light signals over long distances, and receivers in which photodiodes convert the light signals back into an electronic form. The efficiency of optoelectronic devices in a communication system, which include transmitters and receivers, plays the most important role in determining the quality and the bandwidth of a communication system. For transmitters, the efficiency is defined as the ratio of the light entering the optical fiber to the light generated by the laser diode. Therefore, the optical fiber should be aligned as precisely as possible with the laser diode to ensure the high efficiency.
For high performance optoelectronic devices, box-type packages including the dual-in-line package (DIP) and butterfly package with fiber-solder-ferrule (FSF) are widely used. An optical fiber with a metallized end is soldered inside a ferrule tube to form the FSF. The FSF is joined on a u-channel mount in front of laser diode by laser welding. No matter where the fiber locates in the ferrule tube, the place for maximum coupling power can be dynamically measured and then the FSF is fixed. But, researches have shown that the redistribution of residual stress and the stress relaxation of creep phenomenon within the solder will push the fiber shift to the geometrical center of the ferrule and the shift reduces the coupling efficiency of laser module after temperature cycle testing. The efficiency is worse when the initial fiber eccentric offset increased. An optimum approach for reduction of the fiber alignment shift in laser module is to solder the fiber near to the center of the ferrule.
A method for automating the FSF packaging process has been developed to fix the fiber within less than 20um of the center of the ferrule. This method makes use of CCD cameras as position sensors to locate the fiber, and compensates all the major sources of inaccuracy resulting from a typical CCD-based packaging system. The accuracy of the fiber position is highly improved from 80um by traditional packaging process to 20um shown in the experiments. Further work is underway to better the accuracy by compensating the minor sources of inaccuracy.

Contents1
List of Figures2
List of Tables4
摘要5
Abstract6
Chapter 1 Introduction7
1.1 Research Motivation and Purpose7
1.2 Problem Statement12
1.3 Thesis Overview14
Chapter 2 CCD-based inspection method15
2.1 Fiber Gripper Design for Side115
2.2 Side1 Position Detection18
2.3 Capillary Force and Solder Voids Improvement21
Chapter 3 Error Analysis and Proposed Method25
3.1 Positioning error25
3.2. Image inspection error26
3.2.1. Coaxial error of the projection26
3.2.2. Coaxial error of image distortion26
3.2.3. Image blur28
3.3 Platform error29
3.3.1 Shrinkage29
3.4 Proposed Method31
3.4.1 The Side2 position31
3.4.2 Coaxial image projection35
3.4.3 Shrinkage35
Chapter 4 Experiments and Results36
4.1 Experimental Setup36
4.2 Results37
Chapter 5 Conclusion and Further Work45
5.1 Conclusion45
References49

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