基于多模干涉液芯可调谐滤波器  

Tunable Liquid-Core Optical Filter Based on Multimode Interference

作　　者：张燕君[1,2] 徐华斌[1] 谢晓鹏[1] 刘双柱 

机构地区：[1]燕山大学信息科学与工程学院,河北省特种光纤与光纤传感重点实验室,河北秦皇岛066004 [2]江苏天明机械集团有限公司,江苏连云港222062

出　　处：《光学学报》2013年第2期43-48,共6页Acta Optica Sinica

基　　金：国家973计划(2010CB327801);国家自然科学基金(61077067)资助课题

摘　　要：提出了一种基于充液毛细管代替多模光纤的可调谐反射式带阻滤波器,滤波器结构中重要组成部分是一段充入了溶液和汞的毛细管。毛细管的一端与单模光纤共轴对接,另一端用热熔胶密封。由于液体折射率大于毛细管折射率并且毛细管芯径较大,因此液体和毛细管相当于形成了一种大芯径的多模光纤。利用汞的高反射率,实现一种反射式的单模-多模-单模光纤滤波结构。由于毛细管液芯结构对温度的敏感性,在多模干涉原理的基础上,实现可调谐滤波,并从理论仿真和实验证实了可行性。该滤波器具有结构简单、成本低廉等特点,插入损耗为5.12dB,3dB带宽为3.3nm,滤波范围可达到7nm。A tunable reflection type band-rejection optical filter based on capillary filled with liquid instead of multimode fiber is projected. The active component of the structure of filtering is a segment of capillary filling liquid and Hg. One end of the capillary is docked co-axial with a single-mode fiber and the other end is sealed with hot melt adhesive. Refractive index of liquid is greater than the capillary refractive index and the capillary core diameter is larger, so there is equivalent to the formation of a large core diameter multimode fiber. On the basis of the multi- mode interference principle, because the capillary liquid core is sensitive to the temperature, the tunable optical filtering is achieved. Simulation and experiment confirm the feasibility of the theory. The filter has some advantages, such as simple structure, low cost and so on, for which insertion loss is 5.12 dB, 3 dB bandwidth is 3.3 nm and the filtering range is up to 7 nm.

关 键 词：光学器件 多模干涉 毛细管 波分复用 液芯 可调谐滤波器 

分 类 号：TN929.11[电子电信—通信与信息系统]