【摘要】 介绍了全光纤熔融拉锥型3 dB宽带耦合器的理论设计,根据理论设计制作了样品。应用耦合模理论分析了全光纤非对称熔融拉锥型耦合器的宽带特性;提出了3 dB宽带耦合器的制作方案,在此基础上制作了样品;对样品进行测试,样品带宽大约为300 nm(在1300 nm~1600 nm波长之间),附加损耗小于0.5 dB,完全达到了实用化的要求。更多还原

【Abstract】 3 dB wide band coupler is a passive device widely used in optical fiber communication system,optical fiber sensor,optical fiber measurement technology and signal processing system.A fiber fused biconical taper(FBT) 3dB wide band coupler was designed and some samples were manufactured.The bandwidth characteristics of asymmetric FBT coupler were analyzed by coupled-mode equation.The bandwidth of the wide band coupler is about 300 nm(between 1 300 nm and 1 600 nm),while its excess loss is less than 0.5 dB.更多还原