Multimode Interference Refractive Index Sensor Based on Coreless Fiber  

作　　者：Yang Li Zhibo Liu Shuisheng Jian 

机构地区：[1]Institute of Lightwave Technology,Beijing Jiaotong University,Beijing,100044,China

出　　处：《Photonic Sensors》2014年第1期21-27,共7页光子传感器（英文版）

摘　　要：A multimode interference refractive index （KI） sensor based on the coreless fiber was numerically and experimentally demonstrated. Two identical single mode fibers （SMF） are spliced at both ends of a section of the coreless fiber which can he considered as the equivalent weakly guiding multimode fiber （MMF） with a step-index profile when the surrounding refractive index （SKI） is lower than that of the coreless fiber. Thus, it becomes the conventional single-mode multimode single-mode （SMS） fiber structure but with a larger core size. The output spectra will shift along with the changes in the SKI owing to the direct exposure of the coreless fiber. The output spectra under different SKIs were numerically studied, as well as the sensitivities with different lengths and diameters of the coreless fiber. The predication and calculation showed the good agreement with the experimental results. The proposed RI sensor proved to be feasible by verification experiments, and the relative error was merely 0.1% which occupied preferable sensing performance and practicability.

关 键 词：Refractive index sensor multimode interference coreless fiber 

分 类 号：TN252[电子电信—物理电子学] TN253