微环谐振器是集成光学中的关键器件,它的实际滤波特性会受到输入光功率的影响,但长期以来,微环谐振器的稳态模型仅包含线性光学作用。考虑微环谐振器反馈波导中的光学非线性引入的损耗和相移,以及微环耦合器中光学非线性引入的耦合比改变等因素,推导了考虑自相位调制、双光子吸收和热光效应的微环谐振器的非线性模型。重点讨论了双光子吸收和光学非线性引入的耦合器耦合比改变对微环谐振器陷波深度的影响,仿真结果表明,在热光效应和自相位调制产生谐振谱线频移的同时,功率相关的耦合器耦合比的改变对微环谐振器陷波深度的影响较大。

Microring resonator is a key component in integrated optics, and its filtering characteristics in application are affected by the input optical power. However, the steady model of microring resonator only includes the linear optical effects for a long time. In this paper, a new steady model of microring resonator is deduced. The loss and phase shift in the feedback waveguide of the microring resonator and the modification of coupling ratio in the microring coupler induced by optical nonlinear effects are taking into account, and following nonlinear optical effects in silicon waveguide are included: self-phase modulation, two photon absorption and thermal-optical effect. Then the influences of two photon absorption and the modification of coupling ratio in the coupler induced by the optical nonlinearity on the depth of notch filter are emphatically discussed. Simulation results show that when the thermal-optical effect and the self-phase modulation generate the frequency shift of the resonance spectrum, the change of the coupling ratio of the power dependent coupler has a great influence on the notch filter depth of the microring resonator.