摘要
研究并实现了一种基于衍射光栅的FBG解调系统,针对该解调系统从理论上分析了光纤内的模式分布,分析了由FBG引起的模式间耦合效应。根据高斯光束经过该系统后的空间光强分布,采用多项式拟合的方法实现了反射光谱峰值定位算法。通过与高精度光谱仪的测量结果对比表明,该解调方法具有较高的波长解调精度和稳定性。由于系统中不存在扫描机构,该技术可以实现较高的动态扫描频率。
A fiber Bragg grating demodulation system based on diffraction grating is researched and realized,the mode field distribution and the coupled mode theory are employed to interpret the light propagation inside the fiber.Polynomial fit algorithm is realized to locate the peak of the reflected spectrum as the Gauss field maintains its profile of intensity when it travels through the system.The demodulation technique is proved to be with high accuracy and high stability by the result comparison with high accuracy spectrometer.The technique has the potential to guarantee high demodulation frequency as there is no scanning mechanism.
出处
《光学技术》
CAS
CSCD
北大核心
2011年第6期709-712,共4页
Optical Technique
基金
航空集团公司创新团队基金项目
关键词
光纤光栅
衍射光栅
解调
高斯曲线拟合
fiber Bragg grating（FBG）
diffraction grating
demodulation
Gauss curve fit
