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宽带无线通信的带宽瓶颈促进了ROF技术的发展,并使微波光子器件成为研究热点之一。微波光子滤波器(MPF)实现了在光域内直接对微波信号的处理功能,受到了众多研究者的关注。光纤光栅(FBG)具有独特的波长选择和色散特性,是构成MPF结构的最佳可选光器件之一。在理论分析MPF的基础上,结合基于FBG的MPF典型结构给出了影响MPF性能的关键因素,即非相干性、高品质因数、负系数、可调谐性和可重构性。对一阶无限抽头MPF结构进行了建模分析,并提出一种基于FBG的具有平坦、负系数和高品质因数特性的MPF,得出获得高品质因数的最佳条件,理论分析结果和基于FBG的MPF结构的实际仿真结果相吻合。
The bandwidth bottleneck of broadband wireless communication has promoted the development of ROF technology and made microwave photonic devices one of the hot topics. The microwave photonic filter (MPF) has realized the direct microwave signal processing function in the light domain, which has attracted the attention of many researchers. Fiber Bragg Gratings (FBGs), with their unique wavelength selection and dispersion characteristics, are among the best optics that make up the MPF structure. Based on the theoretical analysis of MPF, the key factors affecting the performance of MPF are given in combination with the typical structure of MPF based on FBG, ie, incoherence, high quality factor, negative coefficient, tunability and reconfigurability. The first-order infinite tapped MPF structure was modeled and analyzed, and an MPF based on FBG with flat, negative coefficient and high quality factor was proposed. The optimal conditions for obtaining high quality factor were obtained. The theoretical analysis results and the results of FBF MPF structure of the actual simulation results are consistent.