全光纤干涉式传感结构增敏包层模仿真分析  

Simulation and Analysis of Sensitized Mode of In-Fiber Interferometer

作　　者：马茜 李丽君 孙冉 马克燇 MA Qian;LI Li-jun;SUN Ran;MA Ke-jun(Department of Electrical and information Technology,Shandong University of Science and Technology,Jinan 250031,China;College of Electronics,Communication and Physics,Shandong University of Science and Technology,Qingdao 266590,China;Jinan Industrial Development Investment Group Co.,Ltd.,Jinan 250000,China;College of Automotive Engineering,Qingdao Qiushi College,Qingdao 266000,China)

机构地区：[1]山东科技大学电气信息系,济南250031 [2]山东科技大学电子通信与物理学院,山东青岛266590 [3]济南产业发展投资集团有限公司,济南250000 [4]青岛求实职业技术学院汽车工程学院,山东青岛266000

出　　处：《光通信研究》2019年第2期29-32,42,共5页Study on Optical Communications

基　　金：中国博士后特别资质资助项目(200902574);中国博士后面上资助项目(20080441150);山东省自然基金资助项目(ZR2009AM017;ZR2013FM019);山东省教育厅资助项目(J06P14);青岛开发区资助项目(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资助项目(MDPC201602)

摘　　要：全光纤干涉式传感结构作为一种新兴的高灵敏度和高光学集成性光纤传感器,由于其传感特性与其结构密切相关,使传感器设计更加灵活,因此,传感机理及如何提高测量性能成为研究该类传感器的关键。文章利用有限差分光束法得到全光纤干涉式传感结构中传感光纤部分去包层和弯曲时的输出光谱,再通过傅里叶变换得到空间频谱情况与色散方程进行比对,最终获得两种增敏方式下主要参与耦合包层模的情况。结果表明,相较于未增敏前,增敏后参与耦合的包层模数量有所增多,阶数有所增高,且在一定范围内,弯曲半径越大,主要参与耦合的包层模阶数越高。Due to the advantages of small volume and simple structure,the cladding mode of the in-fiber interference sensor is used widely. Therefore, the investigation of the sensing mechanism and improvement of the measurement performance are the key factors to study this sensor. By using the finite difference beam propagation method, the interference spectrum of the sensors with removing partial of cladding and bending are simulated in this paper. The order of dominant cladding mode is obtained by comparing dispersion equation and spatial frequency spectrum after Fourier transform. The results show that, compared with normal sensor, the orders and numbers of cladding modes both increase. Meanwhile, with the increasing of bending radius within limits, the cladding modes order increase.

关 键 词：全光纤干涉式 包层模 频谱 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]