摘要
针对干涉型光纤传感器中使用单模光纤作为传感器件时,传输光偏振态在双折射影响下所带来的干涉信号"偏振诱导衰落"问题,提出了稳定相干的保偏光路结构。该结构采用单模感应光纤与法拉第旋转镜组合,消除感应光纤偏振特性变化对干涉的影响。同时,通过干涉模块(IU)中使用保偏光纤并以π/2的方式焊接,使光路结构的其他部分均工作在保偏状态,获得稳定相干的保偏光路结构。实验结果表明,该方法能很好地消除偏振态在双折射影响下所带来的干涉信号"偏振诱导衰落",使系统达到偏振稳定,干涉条纹可见度可达40%。
Aiming at the problem that in interference fiber optic sensor,when single mode fiber is used as the sensor device,the transmission light polarization state brings ＂polarization-induced fading＂ of the interference signal under the influence of double refraction,a polarization maintaining light path structure with stable interference is proposed.The structure employs the combination of single mode sensing fiber and Faraday rotating mirror （FRM） to eliminate the effect of the polarization characteristic variation of the sensing fiber on interference.Meanwhile,the polarization-maintaining fiber and polarization-maintaining fiber components are used to form a polarization-immune interfere unit （IU）,which includes a key port connecting to the polarization-maintaining fiber with a polarization axis offset of π/2,which makes the other parts of the light path work in polarization-maintaining state.The Faraday rotating mirror is connected at the end of the sensing fiber to completely eliminate the polarization-induced signal fading in the sensing fiber.Theoretical analysis and experiment results in support of the statements are presented.The experiment results indicate that the proposed method can eliminate the polarization-induced fading of the interference signal brought by the polarization state under the influence of double refraction,which makes the system reach stable polarization,and the interference fringe visibility reaches 40％.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2014年第4期889-893,共5页
Chinese Journal of Scientific Instrument
基金
国家973计划(2010CB327805)
科技支撑计划(2011BAF06B01)
国家重大科学仪器设备开发专项(2012YQ150213)资助项目
关键词
干涉型光纤传感器
偏振诱导衰落
琼斯矩阵
干涉条纹可见度
interference fiber optic sensor
polarization-induced fading
Jones matrix model
interference fringe visibility
作者简介
吴媛,2009年毕业于解放军信息工程大学,现在复旦大学攻读博士学位,主要研究方向为光纤传感技术与信号处理.E-mail：11110300019@fudan.edu.cn｜卞庞,2009年于复旦大学获得学士学位,现在复旦大学攻读博士学位,主要研究方向为光纤传感技术.E-mail：09110300004@fudan.edu.cn｜赵江,分别于2007年和2010年获武汉理工大学学士和硕士学位,现为复旦大学博士研究生,主要研究方向为光纤传感技术.E-mail：jiangzhao11@fudan.edu.cn｜艾鑫,2007年于复旦大学获得学士学位,现在复旦大学攻读硕士学位,主要研究方向为光纤传感技术.E-mail：13210300036@fudan.edu.cn
