摘要
为解决因宽带光源光功率不稳定而造成解调误差较大,以及使用普通光纤Bragg光栅(FBG)解调仪器价格昂贵的问题,提出了一种利用粗波分复用器(CWDM)解调光栅信号的方案.根据FBG反射谱和CWDM边带的滤波特性,采用边带滤波的强度检测方法,设计的全光纤传感解调系统,用于对单点FBG波长移动的解调.运用MATLAB进行数值模拟,结果表明,系统动态范围宽,输出与输入呈线性关系,消除了因光源强度波动和光纤连接器不牢固引入的测量误差.
In order to solve the problem of the error of demodulation caused by fluctuations of the light source and the disadvantage of high price of all kinds of FBG demgdulation instruments, a method, which can demodulate signal from FBG with Coarse Waveband Division Multiplexer（CWDM） , is proposed. According to the characteristics of FBG reflection spectrum and the CWDM side band filtering, an all fiber FBG sensing demodulation method is proposed based on CWDM, which works as an edge filter. The system is for a single FBG demodulation. The performance of the system is evaluated with real value calculation on MATLAB and the result indicates that the method has a wide dynamic range, a linear relationship between input and output of the system. The disturbance caused by light source fluctuation and the uncertainty of fiber connecter can be overcome.
出处
《哈尔滨理工大学学报》
CAS
2006年第2期127-129,134,共4页
Journal of Harbin University of Science and Technology
