全光纤干涉式结构中传感模式仿真分析

发布时间：2018-07-06 18:59

本文选题：全光纤干涉仪 + 有效折射率　；参考：《物理学报》2017年22期

【摘要】：全光纤干涉式传感结构中包层模场与外界物理量作用,携带被感测信息,因此对包层模的研究是设计制作和提高该类传感器传感性能的关键.利用有限差分光束传播法获得传感光纤不同长度和不同芯径比时传感器对应的光谱,通过傅里叶变换获得其干涉频谱,计算出各主要参与干涉的包层模组的有效折射率,利用色散方程确定对应包层模.理论仿真结果显示,随着传感部分光纤长度增加,参与干涉的包层模式随之增加,并且向高阶模式变化,光谱变得稠密,是多阶包层模干涉的叠加,传感器输出干涉谱的自由光谱范围变小.随着输入光纤与传感光纤芯径比变化,会明显改变纤芯包层功率分布,同时,芯径比增大也会增加参与干涉的包层模种类和阶数.
[Abstract]:The cladding mode field acts with external physical quantities and carries sensing information in all-fiber interferometric sensing structure, so the research of cladding mode is the key to design and manufacture and improve the sensing performance of this kind of sensor. By using the finite difference beam propagation method, the spectrum of the sensor with different length and core diameter ratio is obtained. The interference spectrum is obtained by Fourier transform, and the effective refractive index of the cladding module which is mainly involved in the interference is calculated. The corresponding cladding modes are determined by dispersion equation. The theoretical simulation results show that with the length of the sensing fiber increasing, the cladding mode involved in the interference increases, and changes to the higher-order mode, the spectrum becomes dense, which is the superposition of the multi-order cladding mode interference. The free spectrum range of the sensor output interference spectrum is reduced. With the change of core diameter ratio between input fiber and sensor fiber, the power distribution of the core cladding will be changed obviously. Meanwhile, the increase of core diameter ratio will also increase the type and order of the cladding modes involved in the interference.
【作者单位】：山东科技大学电子通信与物理学院;山东科技大学电气与自动化工程学院;山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;
【基金】：中国博士后特别资助项目(批准号:200902574) 中国博士后面上资助项目(批准号:20080441150) 山东省自然基金(批准号:ZR2009AM017,ZR2013FM019) 山东省教育厅(批准号:J06P14) 青岛开发区(批准号:2007-2-39) 矿山灾害预防控制省部共建国家重点实验室培育基地开放基金(批准号:MDPC201602)资助的课题~~
【分类号】：TP212

【相似文献】