OFDR光源非线性调谐引起的距离偏移校正研究  

Research on correction of distance offset caused by nonlinear tuning of OFDR light source

作　　者：唐超[1] 赵方[1] 岳耀笠[1] TANG Chao;ZHAO Fang;YUE Yaoli(The 34th Research Institute of CETC,Guilin Guangxi 541004,China)

机构地区：[1]中国电子科技集团公司第三十四研究所,广西桂林541004

出　　处：《光通信技术》2020年第4期30-32,共3页Optical Communication Technology

基　　金：广西区重点研发计划项目(合同号:桂科AB17129027)资助。

摘　　要：在基于光频域反射仪(OFDR)的光纤距离测量中,光源非线性调谐效应直接影响测量距离的精度,使得OFDR的测量结果发生偏移。通过理论分析调频线性度与测量距离的关系,提出了一种距离校正的方法,利用辅助干涉仪测量光源调谐的非线性偏移量,根据偏移量直接在信号频域上进行插值校正,消除光源非线性调谐对测量距离的影响。实验表明:该方法能够有效提高OFDR测量距离的精度和空间分辨率,能在一个扫频周期内完成运算,具有很高的运算效率。In the optical fiber distance measurement based on optical frequency domain reflectometer(OFDR), the nonlinear tuning effect of the light source directly affects the accuracy of the measurement distance, which makes the OFDR measurement result shift. By theoretically analyzing the relationship between the linearity of laser tuning and measurement distance, a method of distance correction is proposed in this paper. An auxiliary interferometer is used to measure the nonlinearity offset of the light source tuning, and the interpolation is directly performed in the signal frequency domain according to the offset. Experiments show that this method can eliminate the influence of the nonlinear tuning of the light source on the measurement distance,improve the accuracy and spatial resolution of the OFDR measurement distance effectively. Since the calculation is completed in a frequency sweep period, it’s very efficiency.

关 键 词：光频域反射 非线性调谐 距离校正 

分 类 号：TN257[电子电信—物理电子学]