为了优化微环谐振器的性能,提出了一种slot结构的反馈耦合波导微环谐振器。该结构通过在上下载型微环的基础上引入一个附加光场及采用slot波导来改善谐振器的性能参数。利用传输矩阵法分析了该改进型结构对相位、自由光谱范围及输出性能的影响,并用三维有限差分软件FDTD进行了模拟仿真。结果表明:基于微环谐振器的改进型结构的自由光谱范围由14.5 nm增大到了29 nm,消光比的绝对值从21 dB增大到了32 dB,有助于实现对应传感器件测量范围及灵敏度的提升。

In this study, a slot-structured feedback-coupled waveguide microring resonator is proposed to optimize the performance of a microring resonator. Further, the performance parameters of the resonator are considerably improved by the introduction of an additional light field based on the add/drop-type microring and the usage of a slot waveguide. The effect of the improved structure on the phase, free spectral range, and output performance is analyzed using the transfer matrix method, and simulation analysis is performed using the three-dimensional finite difference method software named FDTD. The results denote that the free spectral range of the improved structure increases from 14.5 to 29 nm and that the absolute value of the extinction ratio increases from 21 to 31 dB, which is helpful to improve the measuring range and sensitivity of the corresponding sensor.