基于纺锤型空气腔的光纤马赫-曾德尔折射率传感器  

Optical Fiber Mach-Zehnder Refractive Index Sensor Based on Spindle Air Cavity

作　　者：戴洋 王婷婷[1] 孙家程 王菲 花文栋 DAI Yang;WANG Tingting;SUN Jiacheng;WANG Fei;HUA Wendong(School of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,CHN)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《半导体光电》2020年第2期191-194,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(61405094);江苏省高校优势学科Ⅲ期建设工程资助项目(“信息与通信工程”优势学科).

摘　　要：设计了一种基于光纤纺锤型空气腔的三明治结构全光纤马赫-曾德尔折射率传感器。纺锤型空气腔是通过普通单模光纤和光子晶体光纤熔接后再拉锥形成的。锥区的纺锤型空气腔和包层分别作为参考臂和传感臂,从而形成马赫-曾德尔干涉。基于FDTD Solutions和COMSOL仿真软件分别对传感器的干涉条纹及锥区电场分布进行了仿真,得到了折射率传感器干涉条纹波谷波长和有效折射率与环境折射率的关系。当环境折射率为1.36~1.37和1.37~1.38时,灵敏度分别为1 377.6和1 436nm/RIU。此传感器具有极短的干涉臂,能够降低损耗,且具有较高的折射率灵敏度。A sandwich-structured all-fiber Mach-Zehnder refractive index sensor based on a spindle-type air cavity was designed.The spindle-type air cavity was manufactured by splicing and taper acommon single-mode optical fiber and a photonic crystal fiber.The spindle-type air cavity and cladding in the taper area serve as the referring and sensing arms respectively,then the Mach-Zehnder interference is established.The interference fringes of the sensor and the electric field distribution in the taper area were simulated respectively based on FDTD Solutions and COMSOL.The relationship between the trough wavelength of the index sensor and the environmental refractive index,the effective refractive index and the environment refractive index are obtained by simulations.The sensitivity is 1 377.6 and 1 436 nm/RIU when the refractive index is 1.36~1.37 and 1.37~1.38 respectively.The extremely short interference arm is used to reduce the loss and the sensor has higher refractive index sensitivity.

关 键 词：光纤传感 全光纤 马赫-曾德尔干涉 折射率传感器 

分 类 号：TN29[电子电信—物理电子学]