基于倾斜光纤光栅的四波长传感解调研究

Demodulation of Four Wavelength Sensor Based on Tilted Fiber Bragg Grating

本文从倾斜光纤光栅(TFBG)的传输特性出发,利用了它的边缘滤波解调技术,研究了一种基于倾斜光纤光栅的四波长通道的传感解调。系统由两个耦合器、一个倾斜光纤光栅、四个传感光纤布拉格光栅和两个对应的探测器构成。实验结果表明了,在所测的温度范围内,四个不同波长的传感光纤光栅在解调之后所输出的光功率与温度都具有很好的线性关系,四个通道的温度灵敏度分别为0.107 2 nw/℃、0.193 7 nw/℃、0.298 7 nw/℃、0.232 3 nw/℃。该方案的结构简单、灵敏度高、线性度良好,可以广泛运用于实际当中的温度测量。

A four-wavelength channel sensing demodulation method based on tilted fiber Bragg grating is studied in this paper. The system is based on the transmission characteristics of tilted fiber Bragg grating(TFBG)and its edge filtering demodulation technology. The system consists of two couplers, one tilted fiber Bragg grating, four sensing fiber Bragg gratings and two detectors. The experimental results show that there is a good linear relationship between the output optical power of four different wavelength sensor FBG and the temperature. The temperature sensitivity of four channels are 0.107 2 nw/℃,0.193 7 nw/℃,0.298 7 nw/℃,0.232 3 nw/℃ respectively. The system has the characteristics of simple structure, high sensitivity and good linearity, so it can be widely used in the actual temperature measurement.