吉林大学学报(信息科学版) ›› 2018, Vol. 36 ›› Issue (1): 1-8.

• 论文 •    下一篇

干涉型光纤预警系统入侵信号的调制解调技术

张叶浩, 衣文索, 崔光磊, 王家宁   

  1. 长春理工大学 光电工程学院, 长春 130022
  • 收稿日期:2017-07-26 出版日期:2018-01-25 发布日期:2018-03-14
  • 通讯作者: 衣文索(1971— ), 男, 长春人, 长春理工大学副教授, 博士后, 硕士生导师,主要从事微弱信号检测传感器研究, (Tel)86-13086847178(E-mail)yiws@ jlu. edu. cn。
  • 作者简介: 张叶浩(1992— ), 男, 郑州人, 长春理工大学硕士研究生, 主要从事仪器科学与技术研究, (Tel)86-15567768601(E-mail) 464802847@ qq. com。
  • 基金资助:
    国家自然科学基金资助项目(61675035)

Research on Modulation and Demodulation of Intrusion Signal Based on Interferometric Optical-Fiber Early-Warning System

ZHANG Yehao, YI Wensuo, CUI Guanglei, WANG Jianing   

  1. School of Photo-Electronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
  • Received:2017-07-26 Online:2018-01-25 Published:2018-03-14

摘要:  为解决干涉型光纤预警系统因偏振退化而出现的误报漏报以及定位失准的问题, 在建立 Mach Zehnder 干
涉系统结构模型的基础上, 通过分析入侵信号的调制过程, 得到两种调制信号失真现象, 并详细推导了该问题
的解决方案: 基于耦合器的解调算法。 为使该方案满足工程应用要求, 提出一种参数调校方法消除实际耦合器
不均衡引起的解调结果失真, 并在 Simulink 环境下进行仿真分析。 结果表明, 该解调算法能在耦合器不均衡、
出现偏振退化与待解调信号含有高次谐波的条件下准确还原相位信号, 对系统工程应用具有指导性意义。

关键词: 偏振退化, 光纤传感器, 3×3 耦合器, 解调

Abstract:  In order to reduce the false alert or missed alert which is caused by polarization degradation of
interferometric optical-fiber early-warning system, the modulation process of intrusion signal is analyzed based on
the structure model of Mach Zehnder interferometric system. Two kinds of modulation signal distortion are
studied, and the solution, 3 ×3 coupler demodulation method is derived in detail. To meet the demand of
engineering application, a parameter correction method which can corrected demodulation distortion due to
unbalanced coupler is put forward. Simulation result in Simulink showed that the demodulation method can
restore phase signal accurately while the 3×3 coupler is unbalanced or polarization degradation occurred or the
signal contains high order harmonics and it is useful for engineering application of this system.

Key words:  optical-fiber sensor, demodulation, 3×3 coupler, polarization degeneration

中图分类号: 

  • TN247