论文部分内容阅读
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 FBG demodulation system based on diffraction grating is researched and realized. According to the demodulation system, the mode distribution in fiber is analyzed theoretically and the mode coupling effect caused by FBG is analyzed. According to the spatial light intensity distribution of the Gaussian beam passing through the system, a polynomial fitting method is used to realize the peak position mapping algorithm. Compared with the measurement results of high-precision spectrometer, it shows that the demodulation method has higher precision and stability of wavelength demodulation. Due to the absence of scanning mechanism in the system, this technique can achieve higher dynamic scanning frequency.