Microwave photonic filters have been regarded as an alternative to traditional radio-frequency filters because of their wide bandwidth and large tunability. Integrated microwave photonic filters can integrate all necessary components into a single chip and are highly demanded for future radio-frequency applications. Here, a highly integrated frequency-tunable microwave photonic bandpass filter based on a silicon platform is proposed and demonstrated. The integrated filter consists of a phase modulator, four cascaded microring resonators and a photodetector. The frequency-tunable range of the integrated filter is from 6.1 to 35.9 GHz, and the reconfigurable bandwidth is from 0.22 to 0.54 GHz. A large spurious free dynamic range of 102.1 dB Hz^2/3 is obtained. This highly integrated approach holds great promise for miniaturised, flexible, and high-performance microwave signal processing in modern radar and communication systems.

中文翻译：

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硅集成频率可调谐微波光子带通滤波器

微波光子滤波器因其宽带宽和大可调谐性而被视为传统射频滤波器的替代品。集成微波光子滤波器可以将所有必要的组件集成到单个芯片中，并且对未来的射频应用有很高的要求。在这里，提出并展示了一种基于硅平台的高度集成的频率可调谐微波光子带通滤波器。集成滤波器由一个相位调制器、四个级联的微环谐振器和一个光电探测器组成。集成滤波器的频率可调范围为 6.1 至 35.9 GHz，可重构带宽为 0.22 至 0.54 GHz。^{102.1 dB Hz 2/3}的大型无杂散动态范围获得。这种高度集成的方法为现代雷达和通信系统中的小型化、灵活和高性能微波信号处理带来了巨大希望。