聚合物波导微环陷波滤波器研究

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14.35 GHz准单边带微波信号在长为25 km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12 dB，波长调谐效率为8.2 pm/mW。

Abstract

According to the filter response analysis of the all-pass waveguide micro-ring, the notch filtering function can be achieved when the relationship between the coupling coefficient and the round trip loss meets the critical coupling condition. The micro-ring resonator based on polymer polysiloxane-liquid (PSQ-L) racetrack waveguide is designed and fabricated. With its notch filtering function, the power fading effect induced by the dispersion is suppressed effectively and the quasi-single sideband light-wave carried radio frequency (RF) signal of 14.35 GHz is transmitted through 25 km single mode fiber successively. To improve the flexibility of notch filtering, the conventional direction coupler is substituted with a Mach-Zehnder interferometer (MZI). The micro-ring coupling states, such as over, critical, and under coupling, and the resonant wavelength are tuned agilely by altering the power applied to the heating electrodes on the arm of MZI and the ring waveguide. The maximum notch depth is 12 dB, and the wavelength tuning efficiency is 8.2 pm/mW.

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韩秀友, 王凌华, 王瑜, 邹品, 谷一英, 王锦艳, 蹇锡高, 赵明山. 聚合物波导微环陷波滤波器研究[J]. 光学学报, 2013, 33(7): 0706006. Han Xiuyou, Wang Linghua, Wang Yu, Zou Pin, Gu Yiying, Wang Jinyan, Jian Xigao, Zhao Mingshan. Research of Notch Filter Based on Polymer Micro-Ring Waveguide[J]. Acta Optica Sinica, 2013, 33(7): 0706006.

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