干涉型光纤预警系统入侵信号的调制解调技术
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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。
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.
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.
引文
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[16]毛欣,黄俊斌,顾宏灿.采用3×3耦合器的分布反馈式光纤激光传感器解调技术[J].发光学报,2017,38(3):395-401.MAO Xin,HUANG Junbin,GU Hongcan.Demodulation Technology of Distributed Feedback Fiber Laser Sensor on 3×3Coupler[J].Chinese Journal of Luminescence,2017,38(3):395-401.
[2]廖延彪,黎敏.光纤光学[M].北京:清华大学出版社,2013.LIAO Yanbiao,LI Min.Optic Fiber[M].Beijing:Tsinghua University Press,2013.
[3]CULSHAW B,KERSEY A.Fiber-Optic Sensing:A Historical Perspective[J].Journal of Lightwave Technology,2008,26(9):1064-1078.
[4]姜霁珊,江毅,刘达,等.基于双M-Z干涉仪的光纤周界防护系统[J].光学技术,2015,41(3):193-196.JIANG Jishan,JIANG Yi,LIU Da,et al.Fiber-Optic Perimeter Security System Based on Dual Mach-Zehnder Interferometer Structure[J].Optical Technique,2015,41(3):193-196.
[5]LI R,WANG X,HUANG J,et al.Spatial-Division-Multiplexing Addressed Fiber Laser Hydrophone Array[J].Optics Letters,2013,38(11):1909.
[6]喻骁芒,罗光明,朱珍民,等.分布式光纤传感器周界安防入侵信号的多目标识别[J].光电工程,2014,41(1):36-41.YU Xiaomang,LUO Guangming,ZHU Zhenmin,et al.The Multi Target Recognition of Intrusion Signal of Perimeter Security with Distributed Fiber-Optic Sensor[J].Opto-Electronic Engineering,2014,41(1):36-41.
[7]张春熹,李勤,李立京,等.基于Sagnac组合型干涉仪的光纤分布式扰动传感器(英文)[J].红外与激光工程,2014,43(10):3378-3382.ZHANG Chunxi,LI Qin,LI Lijing,et al.Fiber-Optic Distributed Disturbance Sensor Based on Merged Sagnac Interferometers[J].Infrared and Laser Engineering,2014,43(10):3378-3382.
[8]吴娇.Mach-Zehnder干涉仪在石油管道监控中的应用[D].北京:北京交通大学电子信息工程学院,2012.WU Jiao.Application of the Mach-Zehnder Interferometer in Monitoring Oil Pipelines[D].Beijing:School of Electronic and Information Engineering,Beijing Jiaotong University,2012.
[9]MA C,LIU T,LIU K,et al.A Continuous Wavelet Transform Based Time Delay Estimation Method for Long Range Fiber Interferometric Vibration Sensor[J].Journal of Lightwave Technology,2016,34(16):3785-3789.
[10]LEE B.Review of the Present Status of Optical Fiber Sensors[J].Optical Fiber Technology,2003,9(2):57-79.
[11]DANDRIDGE A,TVETEN A B,GIALLORENZI T G.Homodyne Demodulation Scheme for Fiber Optic Sensors Using Phase Generated Carrier[J].IEEE Transactions on Microwave Theory&Techniques,2003,30(10):1635-1641.
[12]陈宇,林京,孟强.基于3×3耦合器光纤水听器的数字化解调方案[J].仪器仪表学报,2008,29(4):755-759.CHEN Yu,LIN Jing,MENG Qiang.Digitized Demodulation Scheme of Fiber Optical Hydrophones Based on 3×3 Coupler[J].Chinese Journal of Scientific Instrument,2008,29(4):755-759.
[13]刘悦,蒋鹏,马丽娜,等.干涉型光纤传感系统偏振切换技术原理及实验研究[J].激光与光电子学进展,2015,52(12):60-65.LIU Yue,JIANG Peng,MA Lina,et al.Experimental Research on Fiber Optical Sensing System Based on Interferometer with Polarization Switching[J].Laser&Optoelectronics Progress,2015,52(12):60-65.
[14]FORESTIERI E,VINCETTI L.Exact Evaluation of the Jones Matrix of a Fiber in the Presence of Polarization Mode Dispersion of Any Order[J].Journal of Lightwave Technology,2002,19(12):1898-1909.
[15]张雅彬,窦峥,曹家年.干涉型光纤水听器三路输出解调方案研究[J].哈尔滨工程大学学报,2004,25(6):732-735.ZHANG Yabin,DOU Zheng,CAO Jianian.3-Output Demodulation of Interferometric Fiber-Optic Hydrophone[J].Journal of Harbin Engineering University,2004,25(6):732-735.
[16]毛欣,黄俊斌,顾宏灿.采用3×3耦合器的分布反馈式光纤激光传感器解调技术[J].发光学报,2017,38(3):395-401.MAO Xin,HUANG Junbin,GU Hongcan.Demodulation Technology of Distributed Feedback Fiber Laser Sensor on 3×3Coupler[J].Chinese Journal of Luminescence,2017,38(3):395-401.