3×3耦合器解调过程中的偏振分析与处理
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摘要
针对马赫曾德光纤干涉结构的信号解调,理论分析了偏振衰落对3×3耦合器解调的影响,发现椭圆拟合估计法解调的关键是准确获取信号李萨如图形的椭圆表达式,从而提出了基于形态学滤波的偏振处理方法,即利用腐蚀和膨胀滤除椭圆图形中的噪声点,然后用边缘检测方法提取椭圆外轮廓,再用最小二乘数值估计方法求解椭圆参数,最后利用微分交叉相乘方法完成扰动信号的相位还原.仿真结果和现场实验数据证明该方法切实有效,与传统偏振处理方法相比,节省了硬件开支,有效提高了信号解调的稳定性和精确度.
In view of the signal demodulation of the Mach-Zehnder fiber optic interference structure,the influence of polarization fading on the demodulation of the 3×3coupler is theoretically analyzed.It is found that the key to the demodulation of the ellipse fitting estimation method is to accurately obtain the elliptic expression of signal Lissajous figure.A polarization processing method based on morphological filtering is proposed,which uses the erosion and expansion to filter out the noise points in the elliptic pattern,then uses the edge detection method to extract the elliptical outer contour,and then uses the least squares numerical estimation method to solve the ellipse.And finally the differential crossmultiplication method is used to complete the phase reduction of the disturbance signal.The simulation results and field experimental data prove that the method is effective and effective.Compared with the traditional polarization processing method,the cost is saved,and the stability and accuracy of signal demodulation are effectively improved.
In view of the signal demodulation of the Mach-Zehnder fiber optic interference structure,the influence of polarization fading on the demodulation of the 3×3coupler is theoretically analyzed.It is found that the key to the demodulation of the ellipse fitting estimation method is to accurately obtain the elliptic expression of signal Lissajous figure.A polarization processing method based on morphological filtering is proposed,which uses the erosion and expansion to filter out the noise points in the elliptic pattern,then uses the edge detection method to extract the elliptical outer contour,and then uses the least squares numerical estimation method to solve the ellipse.And finally the differential crossmultiplication method is used to complete the phase reduction of the disturbance signal.The simulation results and field experimental data prove that the method is effective and effective.Compared with the traditional polarization processing method,the cost is saved,and the stability and accuracy of signal demodulation are effectively improved.
引文
[1]FENG Lei.Improvement of wavelength demodulation scheme for fiber Bragg grating laser sensing system based on 3×3coupler[J].Chinese Journal of Laser,2008,35(10):1522-1527.冯磊.基于3×3耦合器的光纤光栅激光传感系统波长解调方案的改进[J].中国激光,2008,35(10):1522-1527.
[2]SHENG Yuan-yuan.Analysis of optical fiber sensor vibration detection system[D].Beijing:North China Electric Power University(Beijing),2016.盛媛媛.光纤传感器振动检测系统分析[D].北京:华北电力大学(北京),2016.
[3]MAO Xin,HUANG Jun-bin,GU Hong-can.Distributed feedback fiber laser sensor demodulation technology using 3×3coupler[J].Journal of Luminescence,2017,38(3):395-401.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.
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[7]ZHANG Yi-xin,WANG Shun,ZHANG Xu-ping.Development of adaptive scrambling module for Brillouin optical time domain reflectometry system[J].Electronic Measurement Technology,2008,32(5):31-34,37.张益昕,王顺,张旭苹.布里渊光时域反射传感系统自适应扰偏模块的研制[J].电子测量技术,2008,32(5):31-34,37.
[8]FENG Hao.Modeling and positioning of fiber optic pipeline security early warning system based on dual Mach-Zehnder interferometer structure[D].Tianjin:Tianjin University,2011.封皓.基于双Mach-Zehnder干涉仪结构的光纤管道安全预警系统建模及定位研究[D].天津:天津大学,2011.
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[10]LI Zhi-neng,SHEN Liang,YE Xian-feng.Polarization-independent Michelson fiber-optic sensors[J].Journal of Zhejiang University(Engineering Science),2002,47(1):47-49.李志能,沈梁,叶险峰.偏振无关的Michelson光纤传感器的研究[J].浙江大学学报(工学版),2002,47(1):47-49.
[11]TAN Jing,CHEN Wei-min,FU Yu-mei.The application of Jones matrix in polarization analysis of distributed optical9-2006010fiber sensors[J].Optoelectronic Engineering,2007,34(2):120-125.谭靖,陈伟民与符欲梅.琼斯矩阵在分布式光纤传感器偏振态分析中的应用[J].光电工程,2007,34(2):120-125.
[12]MOU Xu-dong,ZHOU Ke-jiang.Theoretical and experimental research on depolarization fiber optic gyroscope[J].Acta Photonica Sinica,2000,29(9):810-813.牟旭东,周柯江.消偏光纤陀螺的理论和实验研究[J].光子学报,2000,29(9):810-813.
[13]CHEN Xin-wei.Implementation of distributed polarization-maintaining fiber polarization coupled stress sensing system[J].China Laser,2010,37(6):1467-1472.陈信伟,等.分布式保偏光纤偏振耦合应力传感系统的实现[J].中国激光,2010,37(6):1467-1472.
[14]WU Yuan.An interferometric optical fiber sensor for eliminating polarization fading[J].Chinese Journal of Scientific Instrument,2014,35(4):889-893.吴媛.一种消除偏振衰落的干涉型光纤传感器[J].仪器仪表学报,2014,35(4):889-893.
[15]SHEN Liang,YE Xian-feng,LI Zhi-neng.Research and improvement of diversity depolarization fading technology for interferometric fiber sensors and arrays[J].Journal of Transduction Technology,2001,01(3):1-7.沈梁,叶险峰,李志能.干涉型光纤传感器及阵列的分集消偏振衰落技术的研究与改进[J].传感技术学报,2001,01(3):1-7.
[16]LIU Y,WANG L,TIAN C,et al.Analysis and optimization of the PGC method in all digital demodulation systems[J].IEEE Journal of Lightwave Technology,2008,26(18):3225-3233.
[17]XIE Shang-ran.Polarization problems in fiber Brillouin scattering and interference and its distributed sensing applications[D].Beijing:Tsinghua University,2013.谢尚然.光纤布里渊散射与干涉中的偏振问题及其分布式传感应用[D].北京:清华大学,2013.
[18]LIU T,CUI J,CHEN D,et al.A new demodulation technique for optional fiber interferometric sensors with 3×3directional couplers[J].Chinese Optics Letters,2008,6(1):12-15.
[19]WANG Yan.Research on interferometric fiber sensor and PGC demodulation technology[D].Tianjin:Tianjin University of Technology,2014.王燕.干涉型光纤传感器及PGC解调技术研究[D].天津:天津理工大学,2014.
[20]XU Hai-yan.Distributed optical fiber vibration sensor and its positioning technology[D].Shanghai:Fudan University,2012.许海燕.分布式光纤振动传感器及其定位技术研究[D].上海:复旦大学,2012.
[2]SHENG Yuan-yuan.Analysis of optical fiber sensor vibration detection system[D].Beijing:North China Electric Power University(Beijing),2016.盛媛媛.光纤传感器振动检测系统分析[D].北京:华北电力大学(北京),2016.
[3]MAO Xin,HUANG Jun-bin,GU Hong-can.Distributed feedback fiber laser sensor demodulation technology using 3×3coupler[J].Journal of Luminescence,2017,38(3):395-401.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.
[4]XIAO Qian.Research on stable long-distance fiber distributed interferometry technology[D].Shanghai:Fudan University,2013.肖倩.稳定的长距离光纤分布式干涉测量技术研究[D].上海:复旦大学,2013.
[5]SUN Qi-zhen.Research and application of distributed optical fiber sensing and information processing technology[D].Wuhan:Huazhong University of Science and Technology,2008.孙琪真.分布式光纤传感与信息处理技术的研究及应用[D].武汉:华中科技大学,2008.
[6]FENG Hao.Positioning error analysis of pipeline leak detection and early warning system based on Jones matrix modeling[J].Acta Optica Sinica,2009,29(3):723-727.封皓.基于琼斯矩阵建模的管道泄漏检测及预警系统的定位误差分析[J].光学学报,2009,29(3):723-727.
[7]ZHANG Yi-xin,WANG Shun,ZHANG Xu-ping.Development of adaptive scrambling module for Brillouin optical time domain reflectometry system[J].Electronic Measurement Technology,2008,32(5):31-34,37.张益昕,王顺,张旭苹.布里渊光时域反射传感系统自适应扰偏模块的研制[J].电子测量技术,2008,32(5):31-34,37.
[8]FENG Hao.Modeling and positioning of fiber optic pipeline security early warning system based on dual Mach-Zehnder interferometer structure[D].Tianjin:Tianjin University,2011.封皓.基于双Mach-Zehnder干涉仪结构的光纤管道安全预警系统建模及定位研究[D].天津:天津大学,2011.
[9]CHEN Ying.Compensation for polarization mode dispersion of optical fibers in optical signal transmission[J].Chinese Journal of Scientific Instrument,2005,26(S1):484-485.陈颖.光信号传输中光纤偏振模色散的补偿[J].仪器仪表学报,2005,26(S1):484-485.
[10]LI Zhi-neng,SHEN Liang,YE Xian-feng.Polarization-independent Michelson fiber-optic sensors[J].Journal of Zhejiang University(Engineering Science),2002,47(1):47-49.李志能,沈梁,叶险峰.偏振无关的Michelson光纤传感器的研究[J].浙江大学学报(工学版),2002,47(1):47-49.
[11]TAN Jing,CHEN Wei-min,FU Yu-mei.The application of Jones matrix in polarization analysis of distributed optical9-2006010fiber sensors[J].Optoelectronic Engineering,2007,34(2):120-125.谭靖,陈伟民与符欲梅.琼斯矩阵在分布式光纤传感器偏振态分析中的应用[J].光电工程,2007,34(2):120-125.
[12]MOU Xu-dong,ZHOU Ke-jiang.Theoretical and experimental research on depolarization fiber optic gyroscope[J].Acta Photonica Sinica,2000,29(9):810-813.牟旭东,周柯江.消偏光纤陀螺的理论和实验研究[J].光子学报,2000,29(9):810-813.
[13]CHEN Xin-wei.Implementation of distributed polarization-maintaining fiber polarization coupled stress sensing system[J].China Laser,2010,37(6):1467-1472.陈信伟,等.分布式保偏光纤偏振耦合应力传感系统的实现[J].中国激光,2010,37(6):1467-1472.
[14]WU Yuan.An interferometric optical fiber sensor for eliminating polarization fading[J].Chinese Journal of Scientific Instrument,2014,35(4):889-893.吴媛.一种消除偏振衰落的干涉型光纤传感器[J].仪器仪表学报,2014,35(4):889-893.
[15]SHEN Liang,YE Xian-feng,LI Zhi-neng.Research and improvement of diversity depolarization fading technology for interferometric fiber sensors and arrays[J].Journal of Transduction Technology,2001,01(3):1-7.沈梁,叶险峰,李志能.干涉型光纤传感器及阵列的分集消偏振衰落技术的研究与改进[J].传感技术学报,2001,01(3):1-7.
[16]LIU Y,WANG L,TIAN C,et al.Analysis and optimization of the PGC method in all digital demodulation systems[J].IEEE Journal of Lightwave Technology,2008,26(18):3225-3233.
[17]XIE Shang-ran.Polarization problems in fiber Brillouin scattering and interference and its distributed sensing applications[D].Beijing:Tsinghua University,2013.谢尚然.光纤布里渊散射与干涉中的偏振问题及其分布式传感应用[D].北京:清华大学,2013.
[18]LIU T,CUI J,CHEN D,et al.A new demodulation technique for optional fiber interferometric sensors with 3×3directional couplers[J].Chinese Optics Letters,2008,6(1):12-15.
[19]WANG Yan.Research on interferometric fiber sensor and PGC demodulation technology[D].Tianjin:Tianjin University of Technology,2014.王燕.干涉型光纤传感器及PGC解调技术研究[D].天津:天津理工大学,2014.
[20]XU Hai-yan.Distributed optical fiber vibration sensor and its positioning technology[D].Shanghai:Fudan University,2012.许海燕.分布式光纤振动传感器及其定位技术研究[D].上海:复旦大学,2012.
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