基于新型的微纳光纤可调光衰减器的理论研究  

Theoretical Study of Novel Microfiber-Typed Tunable Optical Attenuator

作　　者：季彦呈[1] 陈育培 孙丹 段玮 JI Yancheng;CHEN Yupei;SUN Dan;DUAN Wei(School of Information Science and Technology,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学信息科学技术学院,江苏南通226019

出　　处：《南通大学学报（自然科学版）》2020年第4期31-35,共5页Journal of Nantong University(Natural Science Edition)　

基　　金：国家自然科学基金项目(61801249);江苏省“六大人才高峰”项目(KTHY-052);南通市科技项目(JC2018048);苏州大学高校省级重点实验室开放课题(KJS1858,KJS1204)。

摘　　要：研究了一种新型的微纳光纤可调光衰减器,在此基础上设计了微纳光纤探针式耦合器的模型。该模型通过将锥形光纤探针放置于锥形光纤的锥腰位置,并通过调节探针和锥形光纤之间的夹角实现不同的光衰减度。基于耦合波理论和锥形光纤的模场分布特性,分析了耦合比与探针耦合角度之间的关系。模拟结果表明:当耦合角度为30°时,可得到耦合比为50%∶50%的光衰减器;同时,通过调节锥形光纤探针与微纳光纤的耦合角度可以调节衰减器的输出耦合比,随着耦合角度增大,耦合比增大,两者呈近似线性关系。利用此结构的光衰减器能够较理想地调节或控制光信号,可降低光纤衰减器的复杂程度和成本。In this study,a new type of micro-nano fiber tunable optical attenuator is studied,and the model of micro-nano fiber probe coupler is designed with its help.By placing the tapered fiber probe at the tapered waist position and adjusting the angle between the probe and the tapered fiber,the model achieves different light attenuation.Based on the coupled wave theory and the mode-field distribution characteristics of the tapered fiber,the relationship between the coupling ratio and the coupling angle of the probe is analyzed.The simulation results show that when the coupling angle is 30°,the optical attenuator with a coupling ratio of 50%∶50%can be obtained.At the same time,the output coupling ratio of the attenuator can be adjusted by adjusting the coupling angle between the tapered fiber probe and the micro-nano fiber.The optical attenuator with this structure can adjust or control the optical signal and reduce the complexity and cost of the attenuator.

关 键 词：可调光衰减器 锥形光纤 耦合比 耦合角度 

分 类 号：TN253[电子电信—物理电子学]