摘要
基于双Mach-Zehnder光纤干涉仪的分布式光纤油气管道安全检测及预警系统运行时,由于光纤等效双折射和输入偏振态扰动的影响,常出现相位偏移而导致用于报警定位的两路检测信号相关性下降而产生定位误差。本文提出基于双臂检测信号相关系数的模拟退火算法对输入偏振态进行实时控制,在系统信号相关性恶化时,通过反馈控制改变输入偏振态以恢复信号的良好相关性。现场实验表明,基于双臂检测信号相关系数的模拟退火偏振控制算法,可快速寻找到偏振态最优点,使检测信号维持良好的相关性;相较采用偏振控制之前,系统的工作稳定性得到了明显提高。
In practice, due to fiber birefringence and input polarization, the phase shift often occurs in distributed optical fiber oil and gas pipeline security monitoring and early warning system based on dual MachZehnder fiber interferometers. It also causes the degradation of two detection signals for alarm location and the gross locating error. A new type of Simulated Annealing（SA） method based on dual MachZehnder signal correlation coefficient is proposed for realtime control of input polarization in this paper, which can keep the signals＇ correlation coefficient stable. When the detection signals＇ correlation degenerates ,the input polarization can be changed through the feedback control to recover a steady signal correlation. Field test results show that the Simulated Annealing Algorithm based on dual MachZehnder signal correlation coefficient can make a fast search for the optimal state of polarization, and maintain a steady signal correlation. Compared with the situation without the polarization control, the system＇s stability is significantly improved.
出处
《激光与红外》
CAS
CSCD
北大核心
2012年第3期324-330,共7页
Laser & Infrared
基金
国家自然科学基金重点项目(No.60534050)
天津市自然科学基金项目(No.06YFJMJC02000)资助
