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分析了全通型波导微环的滤波响应特性,该波导微环在耦合系数与微环周损耗满足临界耦合条件时可以实现陷波滤波功能。设计并制备了跑道形聚合物液态聚倍半硅氧烷(PSQ-L)波导微环谐振器。基于其陷波滤波功能,实现了14.35GHz准单边带微波信号在长为25km的光纤中传输,有效抑制了光纤色散导致的微波功率衰减问题。为进一步提高陷波滤波的灵活性,采用马赫-曾德尔干涉(MZI)结构代替传统定向耦合器。通过改变干涉臂和环波导上加热电极的功率实现了微环耦合状态(过耦合、临界耦合、欠耦合)与谐振波长的灵活调谐,最大陷波深度为12dB,波长调谐效率为8.2pm/mW。
The filter response characteristics of all-pass waveguide microring are analyzed. The waveguide microring can realize the notch filter function when the coupling coefficient and the micro-cycle loss satisfy the critical coupling condition. A runway shaped polymer polysilsesquioxane (PSQ-L) waveguide micro-ring resonator was designed and prepared. Based on its notch filter function, 14.35 GHz quasi-single-sideband microwave signal is transmitted in an optical fiber with a length of 25 km, effectively suppressing the microwave power attenuation caused by optical fiber dispersion. In order to further improve the flexibility of the notch filter, Mach-Zehnder interference (MZI) structure is adopted to replace the traditional directional coupler. By changing the power of the heating electrode on the interfering arm and the ring waveguide, flexible coupling of the microring coupling states (overcoupling, critical coupling and under coupling) with the resonant wavelength is achieved. The maximum notch depth is 12dB and the wavelength tuning efficiency is 8.2pm / mW .