基于保偏光纤的双参量单臂游标传感器  

Dual-parameter Vernier fiber sensor in single-arm based on polarization-maintaining fiber

作　　者：刘东梅 王孙德 陈博文 陈严 郑佳伟 王天枢[1,2] LIU Dongmei;WANG Sunde;CHEN Bowen;CHEN Yan;ZHENG Jiawei;WANG Tianshu(Institute of Space Photoelectric Technology,Changchun University of Science and Technology,Changchun 130022,China;School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学空间光电技术研究所,吉林长春130022 [2]长春理工大学光电工程学院,吉林长春130022

出　　处：《红外与激光工程》2025年第2期119-126,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62105042,61975021);吉林省科技发展计划项目(20220508134RC,222619JC010598973)。

摘　　要：提出了一种基于四模光纤(FMF)和保偏光纤(PMF)的折射率、温度双参量传感器。该传感器由保偏光纤内两个马赫-曾德尔干涉腔正交级联,利用两个干涉腔自由光谱范围相近产生游标效应,显著提高折射率和温度灵敏度。单臂结构保证了参考腔和传感腔处于相同的环境中,能够消除环境因素对测量结果的干扰,提高测量的准确性和可靠性。实验结果表明,在1.335 0~1.371 0的折射率范围内,折射率灵敏度为691.194 nm/RIU,线性度为0.995;在30~90℃的温度范围内,温度灵敏度为-829 pm/℃,线性度为0.997。该传感器仅有17.54 cm,具有结构紧凑、制作简单、高灵敏度和低成本等特点,在环境监测和食品安全等方面具有重要应用。Objective Optical fiber sensors are widespread used due to the advantages of electromagnetic interference resistance,excellent sensing performance and minor size.Sensitivity enhancement is always a focus of research.Optical Vernier effect as an effective method to improve sensitivity has attracted significant research interest.The optical Vernier effect is available with the combination of two interferometers,place in series or in a parallel configuration.To employ the optical Vernier effect,the free spectral ranges(FSRs)are designed to be slightly different,which could be achieved by choosing their optical path length(OPL).However,the optical lengths of the sensing cavity and reference cavity must control carefully to realize the Vernier effect.This makes it much more difficult to realize optical Vernier effect.In order to solve the problem,two Mach-Zender interferences(MZIs)with high birefringence in polarization-maintaining fiber(PMF)is proposed to generate optical Vernier effect.This approach allows for the simultaneous adjustment of the optical lengths of two orthogonal MZIs by simply altering the length of the PMF in a single-arm configuration. By cascading the sensing cavity with thereference cavity within this single-arm structure, environmental interference is mitigated, which enhances theaccuracy and reliability of the measurement process.Methods This sensor is constructed by sandwiching a piece of PMF between two four-mode fibers (FMFs)(Fig.1). The FMF is used to excite the high-order modes. Because of self-focusing effect, the outgoing beam willappear two states of convergence and divergence. Through the analysis of simulation, the length of FMF isselected as 1.27 mm. The light from the beam divergence point of the FMF enters the PMF transmitting both inthe core and clad (Fig.3). The PMF is used to obtain orthogonal MZIs. The interference generates between thehigh-order mode and two polarization modes ( mode and mode). Only by changing the length of PMFin single-arm, the optical lengths of two orthogo

关 键 词：游标效应 偏振模式 马赫-曾德尔干涉 双参量传感 

分 类 号：TN253[电子电信—物理电子学]