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Highly tunable microwave and millimeter wave filtering using photonic technology

机译:使用光子技术的高度可调的微波和毫米波滤波

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摘要

The design for a photonic microwave filter tunable in both bandwidth and operating frequency is proposed and experimentally demonstrated. The circuit is based on a single sideband modulator used in conjunction with two or more transmission fiber Bragg gratings (FBGs) cascaded in series. It is demonstrated that the optical filtering characteristics of the FBGs are instrumental in defining the shape of the microwave filter, and the numerical modeling was used to optimize these characteristics. A multiphase-shift transmission FBG design is used to increase the dynamic range of the filter, control the filter ripple, and maximize the slope of the filter skirts. Initial measurements confirmed the design theory and demonstrated a working microwave filter with a bandwidth tunable from approximately 2 to 3.5 GHz and an 18 GHz operating frequency tuning range. Further work is required to refine the FBG manufacturing process and reduce the impact of fabrication errors.
机译:提出并通过实验证明了在带宽和工作频率上均可调的光子微波滤波器的设计。该电路基于一个单边带调制器,该调制器与两个或多个串联的传输光纤布拉格光栅(FBG)结合使用。事实证明,FBG的光学滤波特性有助于定义微波滤波器的形状,并通过数值建模来优化这些特性。多相移变速器FBG设计用于增加滤波器的动态范围,控制滤波器纹波并最大化滤波器裙边的斜率。初步测量证实了设计理论,并演示了工作的微波滤波器,其带宽可调范围约为2至3.5 GHz,工作频率调谐范围为18 GHz。需要进一步的工作来完善FBG制造工艺并减少制造错误的影响。

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