基于频谱分区的高精度光纤光栅波长解调系统

High Precision Fiber Bragg Grating Wavelength Demodulation System Based on Spectrum Segmentation

设计了一种基于频谱分区的高精度光纤光栅波长解调系统。在传统的法布里-珀罗滤波器法中加入法布里-珀罗标准具动态校准滤波器的波长读取值,很好地消除了由滤波器调谐的温度漂移和蠕动引起的测量误差;同时利用标准具及放大自发辐射(ASE)光源特性进行频谱分区解调,大大降低了滤波器调谐时非线性的影响,使得解调系统具有很高的解调精度和很好的稳定性。实验结果表明,系统的稳定性为0.97 pm,分辨率达到了0.33 pm,温度解调线性度为0.9999。

A high precision fiber Bragg grating wavelength demodulation system based on spectrum segmentation is proposed and experimentally demonstrated. Fabry-Perot etalon is added into the traditional Fabry-Perot filter method to dynamically calibrate the read-out value of the filter wavelength, which can eliminate measurement errors caused by the temperature drift effect or the peristaltic effect of Fabry-Perot filter. Meanwhile the amplified spontaneous emission （ASE） spectral characteristics and etalon are used to segment the wavelength for demodulation, which can greatly reduce the effects of the nonlinear effect of Fabry-Perot filter to improve the demodulation accuracy of wavelength and enhance the stability of the demodulation system. The result shows that stability of the system is 0.97 pm, the resolution is 0.33 pm, and the linearity of temperature is 0.9999.