半导体光电, 2011, 32 (6): 773, 网络出版: 2012-01-04  

倏逝波光纤布拉格光栅归一化反射率特性研究

Study on Properties of the Normalized Reflectivity of Fiber Bragg Grating Based on Evanescent Wave
作者单位
重庆理工大学 电子信息与自动化学院,重庆 400054
摘要
基于光波导理论与光纤布拉格光栅(FBG)的模式耦合理论,对倏逝波FBG传感器的能量衰减特性进行了分析研究。最后得到了FBG的归一化反射率的表达式,它是外部介质折射率(SRI)和FBG纤芯直径的函数。理论仿真显示FBG归一化反射率会随着SRI增大和FBG腐蚀程度的加深而减小,呈非线性关系。实验结果也证明增大SRI(小于包层介质折射率) 或者增大FBG的腐蚀程度都会使光纤纤芯中的传输能量减小,增强倏逝波与外部媒介的相互作用,从而增加传感器的灵敏度。
Abstract
Based on the optical waveguide theory and the mode coupling theory of fiber Bragg Grating (FBG), the power attenuation properties of the FBG based on evanescent wave were analyzed. The normalized reflectivity of the FBG, which was the function of the surrounding refractive index (SRI) and the diameter of the FBG, was derived. The theoretical results show that the normalized reflectivity becomes smaller as the increase of the SRI and the depth the FBG. It is also proved that both the increase of the SRI and the etched depth can reduce the intensity of light propagating in the fiber and enhance the interaction between the evanescent wave and the surrounding medium, leading the sensitivity of the sensor to increase.

赵明富, 曹雪梅, 罗彬彬, 刘杰徽, 胡建敢, 韩汐. 倏逝波光纤布拉格光栅归一化反射率特性研究[J]. 半导体光电, 2011, 32(6): 773. ZHAO Mingfu, CAO Xuemei, LUO Binbin, LIU Jiehui, HU Jiangan, HAN Xi. Study on Properties of the Normalized Reflectivity of Fiber Bragg Grating Based on Evanescent Wave[J]. Semiconductor Optoelectronics, 2011, 32(6): 773.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!