摻鉺光纖光放大器之特性及其在光纖通信系統之應用

Abstract

本論文在理論上及實驗上探討摻鉺光纖光放大器的特性及應用。藉由均勻 加寬模型的理論計算，可以得到光纖光放大器的增益及雜訊的一般特性， 並可提供在各種泵激架構及參數下設計光放大器時之參考。此外，對於在 未受泵激的摻鉺光纖中傳播的光信號的衰減及螢光光譜的產生詳加探討， 並將證明當摻鉺光纖足夠短時，螢光光譜的譜線外型與散射截面譜線的外 型線相近。在實驗方面，以倍頻釹雅克雷射做為泵激光源，可產生高增益 、高飽和輸出功率之摻鉺光纖光放大器及寬頻帶波長可調摻鉺光纖環型雷 射。最後，吾人開發各型摻鉺光纖光放大器，並用於中繼及無中繼光纖現 場試用系統、長途陸上光纖傳輸系統、海底光纜系統及光信號分配系統中 。 In this thesis, we study the characteristics and applications of erbium-doped fiber amplifiers (EDFAs) both theoretically and experimentally. By using a homogeneous broadened model, the general behavior of gain and noise figure of EDFAs can be obtained from theoretical simulation results, which provide useful information for EDFA design with various pumping configurations and parameters. Also, the optical signals propagate in an erbium-doped fiber without pump has been investigated thoroughly, and the attenuation of optical signal and the generation of fluorescence power spectrum can be observed. Furthermore, we will show that the emission cross section profile of EDF can be obtained from this fluorescence spectrum when the EDF is short enough. A high gain, high saturation power amplifier and a widely tunable EDF ring laser pumped by a frequency- doubled Nd:YAG laser at 532 nm are demonstrated. Finally, various types of EDFAs have been developed, and their applications in field trial system with and without optical repeater, long-haul terrestrial operating systems, undersea optical cable systems and optical distribution systems will be reported.