光子学报, 2015, 44 (6): 0606001, 网络出版: 2015-06-25
基于非线性频率调制的光脉冲压缩反射测量方案
Scheme of Optical Pulse Compression Reflectometry Based on Nonlinear Frequency Modulation
光纤传感 光脉冲压缩反射仪 匹配滤波 频率调制 分辨率 峰值旁瓣程度评价 自相关函数 Optical sensor Optical pulse compression reflectometry Matched filter Frequency modulation Resolution Peak side-lobe level estimator Autocorrelation function
摘要
为了克服线性调频技术中的旁瓣过高的缺点,提出一种基于非线性调频技术的光脉冲压缩反射仪方案.将非线性调频脉冲信号通过单边带调制器调制到光信号上,并将光电探测器接收到的瑞利散射、端面反射等信号和该非线性调频脉冲信号进行匹配滤波,得到脉冲压缩曲线.理论、数值仿真和实验证明了非线性调频技术能有效抑制光脉冲压缩反射仪中的旁瓣.实验结果表明,使用相干长度为2km的光源,该方案的测量距离可达5.4km、空间分辨率达16.5cm、非线性调频的旁瓣抑制比比线性调频高5.8dB.
Abstract
A scheme of Optical Pulse Compression Reflectometry(OPCR)system based on Nonlinear Frequency Modulation(NLFM)was proposed,which can overcome the shortcoming(high side lobes)of Linear Frequency Modulation(LFM)based OPCR.The optical signal was modulated by NLFM pulse signal in single sideband modulation.Rayleigh scattering and ending reflection signal detected by photodetector was matched filtering by use of the NLFM pulse signal so as to achieve the OPCR reflection trace.Theoretical analysis,numerical simulation and experimental study verify that the NLFM based OPCR system can reduce the magnitude of the side lobes.In the experiment,the measuring range reaches 5.4km although 2km coherence-length laser is used,the spatial resolution is 16.5cm,and the side-lobe suppression rather than LFM is 5.8dB.
张钰洲, 邹卫文, 龙鑫, 陈建平. 基于非线性频率调制的光脉冲压缩反射测量方案[J]. 光子学报, 2015, 44(6): 0606001. ZHANG Yu-zhou, ZOU Wei-wen, LONG Xin, CHEN Jian-ping. Scheme of Optical Pulse Compression Reflectometry Based on Nonlinear Frequency Modulation[J]. ACTA PHOTONICA SINICA, 2015, 44(6): 0606001.
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