J4 ›› 2015, Vol. 32 ›› Issue (1): 123-128.

• 纤维与波导光学 • 上一篇    

基于相位敏感OTDR系统的信号解调方法的研究

方英兰1,刘升沈成银洪炎纪利琴王月琴   

  1. 1 安徽新华学院电子通信工程学院,安徽 合肥 230088; 2 中科院合肥物质科学研究院医学物理与技术中心,安徽 合肥 230031
  • 收稿日期:2014-04-17 修回日期:2014-05-06 出版日期:2015-01-28 发布日期:2015-02-04
  • 通讯作者: 方英兰 (1986-),女,安徽安庆人,主要从事信号与信息处理方面的研究。 E-mail:fyl_cherry@163.com
  • 基金资助:
    国家重点实验室项目资助(PCRRF13024)、安徽省自然科学基金资助(11040606Q60)

Research of signal demodulation method based on phase-sensitive OTDR

FANG Ying-lan1, LIU Sheng2, SHEN Cheng-yin2, Hong Yan2, JI Li-qin1, WANG Yue-qin1   

  1. 1 Electronic Communication Engineering College, Anhui Xinhua University, Anhui Hefei 230088, China; 2 Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Anhui Hefei 230031, China
  • Received:2014-04-17 Revised:2014-05-06 Published:2015-01-28 Online:2015-02-04

摘要: 提出了一种改进的关于相位敏感OTDR(光时域反射计)系统的信号处理解调方法。首先,从理论上阐述了该方法的原理。其次,分析了该方法中关键参数(平均次数、滑动窗口和相减间隔)的取值对相位敏感OTDR系统的信号处理结果的影响,并且总结了它们取值的指导依据。最后,与常规的数字平均方法对比,利用该方法进行数据处理,有效的解调出扰动信号,进一步说明该方法的可行性。结果表明,该方法根据信号的波动特征将原始数据进行分组,提高了各组数据的相关性,从而明显改善了系统的信噪比,对长距离相位敏感OTDR系统性能的优化有一定的指导意义。

关键词: 纤维与波导光学, 相位敏感OTDR, 数字平均, 滑动窗口, 相减间隔

Abstract: An improved signal demodulated method based on phase-sensitive OTDR system was proposed. Firstly, it illustrated the principle of this method theoretically. Then, the effect of the values of key parameters (average time, moving window, substracting interval) on the result of signal processing of the phase-sensitive OTDR system is analyzed and the guidance to determine the values of these key parameters is summarized. Lastly, compared with the conventional digital average method, the disturbance signal is was effectively demodulated with this method processing datas, which illustrated the feasibility of this method further. The result shows that this method increases the correlation of each group datas with dividing original datas into groups as the fluctuation characteristics of signals, thus improving the SNR of system obviously. This method has guidance to optimize the performance of long distance phase-sensitive OTDR to some extent.

Key words: fiber and waveguide optics, phase-sensitive OTDR, digital average, moving window, substracting interval