光学精密工程2012，Vol.20Issue(3)：468-476,9.DOI:10.3788/OPE.20122003.0468
双Mach-Zehnder光纤干涉传感系统中的偏振衰落控制
Control of polarization fading for dual Mach-Zehnder fiber interferometric sensing system
摘要
Abstract
In a dual Mach-Zehnder fiber interferometric sensing system, the high locating accuracy is hardly obtained due to the discrepancy of two detection signals resulting from polarization fading. To keep the stability of the detection signals, a method to control the polarization fading was proposed in this paper. A optical polarization model was established to analyze the origin of polarization fading in the system. It points out that the basic reason for the discrepancy of the detection signal correlation is from that the inconsistency of the polarization characteristics between two sensing fibers results in the effect of the input polarization on detection signals. Based on the analysis, the solutions of controlling the input polarization and searching for the working points of polarization state were put forward to e-liminate the polarization fading. Furthermore, the requirements of polarization control were further determined by analyzing the relation between signal correlation coefficients and two parameters of input polarization, and simulated annealing was applied to the verification of this theory. Field test results show that the algorithm can make a fast search for the working points of polarization state, and can maintain a steady signal correlation. It is proved that the polarization fading control method is feasible and effective.关键词
相干光学/Mach-Zehnder干涉仪/干涉传感/偏振衰落/偏振控制/相关系数/模拟退火算法Key words
coherence optics/ Mach-Zehnder fiber interferometer/ interferometric sensing/ polarization fading/ polarization control/ correlation coefficient/ simulated annealing分类
机械制造引用本文复制引用
曾周末,张溪默,封皓,靳世久,安阳..双Mach-Zehnder光纤干涉传感系统中的偏振衰落控制[J].光学精密工程,2012,20(3):468-476,9.基金项目
国家自然科学基金资助项目(No.60974110) （No.60974110）
国家教育部博士点基金资助项目(No.200800560020) （No.200800560020）
