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随着人们对宽带无线通信带宽需求的不断增加,微波光子学器件的研究成为热点之一,近几年,光学器件的发展非常迅速,基于此的微波光子滤波器的应用和研究也逐步成熟起来。在深入研究微波光子滤波器性能理论的基础上,提出了一阶无限抽头响应的微波光子滤波器(IIRMPF)模型,利用自动控制原理动态结构图的变换知识进行理论推导,得出当反馈回路中加权系数和增益系数的乘积为1时,一阶IIRMPF可以得到最大的品质因数(Q值),并通过建立基于光纤布拉格光栅(FBG)和有源光纤的IIRMPF结构进行验证。结果表明,该结构与理论推导相吻合,最后实验制作了反射率分别为99.5%和50%的FBG,得到了Q值为804的微波光子滤波器响应。
With the increasing demand for broadband wireless communication bandwidth, the research of microwave photonic devices has become one of the hot spots. In recent years, the development of optical devices has been very rapid. The application and research of microwave photonic filters based on this have also gradually matured . On the basis of further research on microwave photonic filter performance theory, the first order infinite tap response microwave photon filter (IIRMPF) model is proposed, and the theoretical derivation is made based on the knowledge of transformation of dynamic structure diagram of automatic control principle. The product of the weighting factor and the gain factor is 1, the first-order IIRMPF can obtain the maximum quality factor (Q value) and is validated by establishing the IIRMPF structure based on fiber Bragg grating (FBG) and active fiber. The results show that the structure is consistent with the theoretical derivation. Finally, the FBG with reflectivity of 99.5% and 50% is fabricated. The microwave photon filter with Q value of 804 is obtained.