- 學位論文
雙向三頻光收發模組之光路耦合設計
Design of Optical Coupling for Bi-Directional Triplexer Transceiver Module
摘要
乙太網路( Ethernet )為現今區域網路中佔有比例最高( 95% )的傳輸架構，隨著頻寬需求與使用者增加，原先技術已不敷使用。藉著引進光纖元件與系統技術，傳輸速度可大幅提升。由於光收發器成本最高的地方在於封裝製程，而封裝最困難的為光學對位，因此在選用光電元件時，必須將對位容忍度與光耦合效率當作第一考量。 傳統型雙向式三頻光收發模組（Triplexer）之光路採用人工對位，不但組裝成本高、耗時而且對位誤差的容魚d圍也較低。本論文嘗試使用光纖（Fiber）做為光路耦合之傳輸介質，並配合設計出具有V型溝槽之光學組裝平台，不但可降低組裝成本（時間），還可提高光路耦合效率。實際製作時，可先使用光學軟體模擬並計算出各光學元件間之最佳間隙，再於組裝完成之後進行間隙微調。透過本論文所實作完成之SMF / MMF ( Single-Mode Fiber / Multi-Mode Fiber ) 光路耦合收發模組，實際量得模組整體耦光效率( Coupling Efficiency ) 為9.3 ﹪（-10.3 dB），已符合IEEE 802.3z的規範；實驗也証明，模組確實通過1.25 Gbps的Eye Mask Test規範。
並列摘要
As a result of the rapidly growing volume of data transfer in telecommunication networks, data streams for digital video, high-definition television (HDTV), and color graphics are requiring higher and higher bandwidth. It leads people to consider the optical communication to be a good solution for today’s digital life networks. In spite of the importance in wide band communication, the assembly procedures of the optical communication system, especially for the triplexers, are still so complicated as to be costly. This thesis adopts two ideas in the improvement of the assembly of the triplexer. One of them is the usage of multi-mode optical fibers in constraining the optical beams to travel in the desired paths. Then the well conducted optical beams are coupled with each others in self-alignment V-groove platforms which could immunize the fiber coupling from lateral misalignment, angular misalignmnet, and even the separation between fiber ends. Here the usage of the V-groove platform is the other contribution of this work and it is proved to be helpful not only in the simplification of the assembly but also in the enhancement of the couple efficiency. To raise the optical coupling efficiency further, ASAPTM and Beam-PROPTM software are also employed in this work. They are used in the calculation of the optimum gap between two optical elements. The measurement shows that the total optical coupling efficiency of the implemented optical system is 9.3 ﹪(-10.3 dB) which is in compliance with IEEE 802.3z standard.