超结构布喇格光栅滤波器的研究

用傅立叶方法和耦合模理论分别对取样光纤光栅进行了分析,并采用数值模拟的方法分析了占空比T对取样光纤光栅光谱特性的影响。研究表明,反射率较低时,取样光栅的反射峰间隔及数目基本上由取样周期P决定。但当T>0.1时,反射峰间隔变得与T有关。该结构对一般文献中得到的反射峰间隔表达式提出了置疑。在文中理论的指导下,提出了一种经济有效的光纤光栅梳状滤波器的制作方法。

Research on the Filters with Super-structured Fiber Gratings

Sampled fiber grating was analyzed with Fourier method and coupled mode theory respectively. Numerical simulation was carried out, the result suggested that sampled rate T could affect the spectral property of the sampled fiber grating. It was found in the research that the interval between two reflective peaks and their number were basically determined by sampling period P when reflective ratio was low. However, when T>0. 1, the interval becamerelated to T. The result in this paper queried the conclusion gotten in other papers, in whichthe reflective peaks were always expressed as: Based on the theory in the pa-per, an effective and economical method to fabricate comb-filter was proposed.