被動式光纖網路是目前在光通訊領域中極為重要的一項發展技術。本篇論文主要是探討在被動式光纖網路中應用光纖拉曼放大器來當作功率放大器,憑藉其低雜訊特性,提高系統的整體接收靈敏度,從而延長傳輸距離或提高系統設計餘裕度。所以本文提出兩個中心議題針對拉曼放大器在傳統的應用上做改善,首先以“高功率少泵激波長”取代現行所採用“低功率多泵激波長”的配置,不僅在確保“Raman 增益放大頻寬”不變的條件下,可將二泵激雷射之間的配置拉寬至45nm,可減少使用一顆泵激雷射,且無須大幅度增加泵激功率的情況下即可達到±1dB增益平坦度。另外本文再提出可利用殘餘的泵激功率使入射信號來回通過增益介質兩次,進而提高放大效率比傳統放大器高出約50%。
The technology of Passive Optical Network (PON) was most important in optical communication system. The topic of this thesis is probe into Raman fiber amplifer apply to power amplifier in passive optical network system, base on low noise property that is able to improve sensitivity and margin of system design and extend transmission distance. There are two main topics suggestion in this thesis, The first, to replace “More pumps for low power”with“Less pumps for high power”in general application, base on the same condition for“Raman gain bandwidth”, that can increase the space of pumping configuration to 45nm, and able to obtain ±1dB gain-flattened and saving one pumping laser in use, needless to increase pumping power greatly. The second part focused on high-efficiency Raman fiber amplifier (RFA), by setting up reflection route on the structure end, pumping efficiency is improved by the double-pass gain medium scheme for signal. The efficiency of pump laser used in the structure is 50% higher than the conventional configuration. A higher gain and high efficiency architecture is achieved.