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设计了一个基于硅基微环的超紧凑的微波光子滤波器,用以提高硅基微波光子器件的集成密度及增大其自由光谱范围。根据波导光学的耦合模理论,推导出双环并联谐振器的光强传递函数,并通过仿真得到了微波光子滤波器的输出特性。结果表明:当微环半径为0.79μm时,谐振器中直波导宽度为0.3μm,环形波导宽度为0.25μm,滤波器的自由光谱范围为140 nm,插入损耗为0.5 dB,半峰全宽为7 nm,此滤波器的性能完全满足粗波分复用系统的要求。
An ultra-compact microwave photonic filter based on silicon-based micro-rings was designed to improve the integration density and increase the free spectral range of silicon-based microwave photonic devices. According to the coupling theory of waveguide optics, the light intensity transfer function of the double-ring parallel resonator is deduced. The output characteristic of the microwave photon filter is obtained through simulation. The results show that when the micro-ring radius is 0.79μm, the straight waveguide width in the resonator is 0.3μm and the ring waveguide width is 0.25μm. The free spectral range of the filter is 140 nm, the insertion loss is 0.5 dB, the full width at half maximum 7 nm, the performance of this filter fully meets the requirements of the coarse wavelength division multiplexing system.