Simulations of ultra-high sensitivity RI sensor in triple-core fiber with modified Vernier effect:Application in marine RI measurement  

作　　者：XIONG Lingyi YU Yangfei DUAN Shaoxiang LIU Bo LIN Wei YAO Yuan 

机构地区：[1]Institute of Modern Optics,Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Nankai University,Tianjin 300350,China [2]Marine Protected Area Administration of Sansha City,Sansha 573100,China [3]Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519000,China

出　　处：《Optoelectronics Letters》2023年第8期481-486,共6页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11774181,62231005,62275131 and 62105164);the Natural Science Foundation of Tianjin(Nos.19JCYBJC16700,20JCQNJC01480,21JCQNJC00210 and 21JCYBJC00080);the Tianjin Graduate Research Innovation Project(No.2022BKY006);the Tianjin Development Program for Innovation and Entrepreneurship;the Fundamental Research Funds for the Central Universities,Nankai University。

摘　　要：We proposed an ultra-high sensitivity triple-core fiber refractive index(RI)sensor with a modified Vernier effect for marine RI measurement and demonstrated it by numerical simulation.This sensor composes a pair of parallelized spatial mode Mach-Zehnder interferometers(MZIs),both of which are involved in sensing,but possess different interfering modes.By designing an MZI RI fiber optic sensor based on Vernier effect in air,it is demonstrated that in the low RI such as air environment,only the modes involved in sensing interference are affected by the environment to generate Vernier effect.In the high RI marine environment,both sensing interferometer and reference interferometer need to be affected by the ambient RI to generate Vernier effect.The simulation results indicate that the proposed novel sensing structure can amplify its sensitivity from-15428 nm/RIU to-24857 nm/RIU in the marine environment.

关 键 词：INTERFEROMETER FIBER effect 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] P716[自动化与计算机技术—控制科学与工程]