FBG阵列的多重反射性能优化

为抑制光脉冲经过布拉格光纤光栅(FBG)阵列时所产生的冗余次级迭代多重反射,运用模式耦合理论和行列式法分析了FBG的反射特性及各项参数,得到了在固定结构低损耗二阶FBG阵列中抑制光脉冲多重反射的最优化光栅各参数.将优化参数应用于基于二阶FBG阵列的相关函数(检验光系统)的结果显示,光脉冲的自相关程度提高了约28.6%,互相关程度降低了约37.0%.这表明通过优化配置参数可有效降低FBG阵列的多重反射,进而可提高光通信与光传感系统的信号精度.

Multi-reflection optimization of FBG array

Redundant secondary iterative multiple reflections are generated when the optical pulse signal passes through the fiber Bragg grating(FBG)array, which leads to signal degradation and sensor accuracy degradation. Optical mode coupling theory and determinant method are used to analyze the characteristics of FBG, and the optimal parameters of fixed structure 2 - tap FBG array are obtained to suppress the multiple reflections of optical pulse. The application in a 2 - tap FBG -based correlation function inspection system shows that the auto -correlation of the light pulse is increased by 28.6%, and the cross -correlation is decreased by 37.0%.The results indicate that the signal accuracy of the optical communication and optical sensing system can be improved efficiently by optimizing the configuration parameters to reduce the multiple reflection of the FBG array.