鉴于横向应力和温度对光纤布拉格光栅的交感耦合呈现非线性关系,将横向局部应力与温度的交感问题转化为非线性系统参数辨识问题:首先根据光纤布拉格光栅横向应力与温度的传感原理构造一个理论意义上的反射光谱,然后利用理论光谱和采样光谱之间的差异度建立系统参数辨识模型,通过差分进化算法对该优化辨识模型进行求解,最终实现横向局部应力与温度的同时测量.实验和仿真结果表明,本文提出的方法具有较高的辨识精度,得到的横向应力误差绝对值一般小于4.0×10-3N,温度误差绝对值一般小于3.0×10-3℃,传感器对温度的灵敏度为11.7 pm/℃.该方法能够解决光纤布拉格光栅横向局部应力和温度的交叉敏感问题,提升光纤布拉格光栅传感网络在实际工程中的传感精度.更多还原

A wavelength detection method for a wavelength division multiplexing (WDM) fiber Bragg grating (FBG) sensor network is proposed based on least squares support vector regression (LS-SVR). As a kind of promising machine learning technique, LS-SVR is employed to approximate the inverse function of the reflection spectrum. The LS-SVR detection model is established from the training samples, and then the Bragg wavelength of each FBG can be directly identified by inputting the measured spectrum into the well-trained model. We also discuss the impact of the sample size and the preprocess of the input spectrum on the performance of the training effectiveness. The results demonstrate that our approach is effective in improving the accuracy for sensor networks with a large number of FBGs.

An effective optimization method based on a self-adaptive differential evolution (DE) algorithm is proposed to design high-channel-count fiber Bragg grating (FBG) filters. By combining the optimization algorithm with the tailored group delay technology, we have established a mathematical model aiming at minimizing the maximum index modulation of the grating. Equipped with a parameter self-adaptive strategy, the improved DE algorithm shows its powerful global searching ability in finding the optimal group delay parameter for each channel. Design examples demonstrate that the proposed approach yields better results with a remarkable reduction in the maximum index modulation compared with the previous works. Furthermore, we numerically present a 1037-channel 50-GHz spaced FBG filter enabling to cover the whole bands (O + E + S + C + L + U), which indicates the potential application of this method in the dense wavelength-division multiplexing (DWDM) system.