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中文摘要：
基于耦合模理论、微环谐振理论和电光调制理论,提出了一种可由电光调谐并带有两段U型波导的微环谐振器,通过仿真结果讨论了输出光谱、U型波导长度和耦合系数等参数的变化关系。仿真结果证明,相比较于其他报道过的带有U型波导的微环谐振器,本文所提出的微环谐振器在耦合系数取0.1时,实现了60dB以上的极高消光和极窄的带宽,同时自由光谱范围（FSR）可达到56nm。通过改变加载在微环和U型波导上的电压,可以分别实现波长和消光比的调谐。
英文摘要：
Based on coupling mode theory, microring resonant theory and electro-optical modulation theo- ry,we propose an electro-optically tunable microring resonator with two U-bend waveguides. The rela-tionships between output spectrum and the length of U-bend waveguide as well as coupling coefficient are analyzed through simulation. The simulation results show that the 15μm radius microring outputs a relatively large free spectrum range of 56 nm, a 60 dB higher extinction ratio and an extremely narrow bandwidth when the coupling coefficient is locked in a very reasonable range. Besides, the output wave-length and extinction ration can be modulated by the voltages loaded on microring and U-bend waveguide respectively.
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