基于双螺旋微纳光纤耦合器的光学游标传感特性研究  

Sensing Characteristics of Optical Vernier of Double-Helix Micro-Nano Optical Fiber Coupler

作　　者：李玉洁 罗彬彬[1] 邹雪[1] 石胜辉[1] 范俊豪 吴德操 陈荟吉 杨翔文 古洪 赵明富[1] Li Yujie;Luo Binbin;Zou Xue;Shi Shenghui;Fan Junhao;Wu Decao;Chen Huiji;Yang Xiangwen;Gu Hong;Zhao Mingfu(Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学光纤传感与光电检测重庆市重点实验室,重庆400054

出　　处：《中国激光》2023年第14期160-169,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61875026);重庆英才青年拔尖人才计划(cstc2021ycjh-bgzxm0128);重庆英才创新领军人才计划(cstc2021ycjh-bgzxm0287);重庆市教委科学技术研究重点项目(KJZD-K202201106);重庆理工大学研究生科研创新项目(gzlcx20223068)。

摘　　要：针对双螺旋结构微纳光纤耦合器(DHMC),理论研究其游标效应的内在机理和光谱特性。实验制备直径为5~7μm的DHMC,并研究其应变、温度以及折射率的传感特性,采用快速傅里叶变换(FFT)并利用带通滤波对特征干涉光谱数据进行提取,分别得到在x、y正交偏振态下的干涉光谱以及它们叠加形成的游标光谱。实验结果表明:制备的DHMC的结构参数及光谱特性与基于理论分析的预测基本吻合;DHMC的x、y偏振态干涉谱叠加形成的游标效应光谱与x、y正交偏振态下的干涉光谱相比较,对应变和温度传感呈现出减弱的光学游标效应,而对折射率传感则呈现出增强的光学游标效应。以上研究结论对DHMC的制备及其在折射率、温度及应变传感中的应用具有实际指导意义。Objective In recent years,vernier effect has attracted much attention in the field of optical fiber sensing due to its sensitivity amplification effect,which has been used to measure gas pressure,temperature,strain,refractive index,etc.The configurations used to introduce optical vernier effects fall into two broad categories.The first type consists of configurations containing a single type of interferometer.The second type consists of a hybrid configuration in which two different types of interferometers are combined.The optical vernier effect can be applied to different types of interference structures,such as Mach-Zehnder interferometers (MZIs),Fabry-Perot interferometers (FPIs) and Sagnac interferometers (SIs),etc.Since the double-helix micro-nano fiber coupler (DHMC) is highly birefringent,the superposition of two orthogonal polarization interference spectra in x direction and y direction with slightly different interference periods can form the vernier envelope.However,how to get the DHMC that can produce the vernier envelope spectrum?What’s more,when the optical vernier effect of the DHMC is applied to temperature,strain and refractive index sensing,whether the sensing characteristics are consistent or not is a problem that needs to be considered.In the present study,the internal mechanism and spectral characteristics of the vernier effect of the DHMC are studied theoretically.DHMCs with different diameters are fabricated,and experiments of the strain,temperature and refractive index sensing are carried out.We hope that the above results have a good guiding significance for the preparation of DHMC and the applications of refractive index,temperature and strain sensing.Methods Theoretical and experimental analysis methods are employed in this paper.Firstly,COMSOL software was used to establish the DHMC simulation model (Fig.1).Then,by setting parameters such as wavelength range,diameter and refractive index,the effective refractive indices of odd and even modes in x-and y-polarization states were obtaine

关 键 词：光纤光学 光纤传感器 双螺旋微纳光纤耦合器 折射率 温度 轴向应变 

分 类 号：TN253[电子电信—物理电子学]