摘要
基于倾斜光纤光栅模式耦合理论,采用OptiGrating软件仿真分析了倾斜光纤光栅(TFBG)在不同环境折射率下的光谱特性变化。结果表明,当外界环境折射率小于包层模折射率时,TFBG的纤芯模和包层模都会存在;当外界环境折射率大于等于包层模折射率时,只有纤芯模存在,包层模会消失。在蒸馏水、无水乙醇、红花油、花生油和大豆油溶液中,TFBG的光谱特性实验结果与仿真结果一致。研究结果对装有大折射率液体的管道泄漏的实时监测具有一定的指导意义。
Based on the mode coupling theory of a tilted fiber grating(TFBG), the spectral characteristics of a TFBG under different ambient refractive indexes are studied by the Optigrating software. The results show that when the ambient refractive index is less than the refractive index of the cladding mode, both the core mode and the cladding mode of the TFBG exist;in contrast, when the ambient refractive index is larger than or equal to the refractive index of the cladding mode, only the core mode exists and the cladding mode disappears. The experimental results of this TFBG in distilled water, anhydrous ethanol, safflower oil, peanut oil and soybean oil are consistent with the corresponding simulation results. These research results have certain guiding significance for the real-time leakage monitoring of pipelines full of liquids with larger refractive indexes.
作者
钟建辉
冯艳
张华
肖佳明
Zhong Jianhui;Feng Yan;Zhang Hua;Xiao Jiaming(Jiangxi Key Laboratory of Robot and Welding Automation,School of Mechanical and Electrical Engineering,Nanchang University,Nanchang,Jiangxi 330031,China;Institute of Robotics,School of Mechanical and Automotive Engineering,Shanghai University of Engineering and Technology,Shanghai 201620,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第11期79-83,共5页
Laser & Optoelectronics Progress
基金
国家自然科学基金(51665039)
江西省自然科学基金(20202BAB204018)
江西省优势科技创新团队建设计划(20171BCB24001)。
关键词
光栅
倾斜光纤光栅
折射率
透射光谱
包层模
纤芯模
gratings
tilted fiber grating
refractive index
transmission spectrum
cladding mode
core mode
