Abstract
We propose a method for generating the electromagnetically induced transparency (EIT) like-transmission by using microring resonator based on cascaded 3 × 3 multimode interference (MMI) structures. Based on the Fano resonance unit created from a 3 × 3 MMI coupler with a feedback waveguide, two schemes of two coupled Fano resonator unit (FRU) are investigated to generate the EIT like transmission. The theoretical and numerical analysis based on the coupled mode theory and transfer matrix is used for the designs. Our proposed structure has advantages of compactness and ease of fabrication. We use silicon waveguide for the design of the whole device so it is compatible with the existing Complementary Metal-Oxide-Semiconductor (CMOS) circuitry foundry. The fabrication tolerance and design parameters are also investigated in this study.
Highlights
The electromagnetically induced transparency (EIT) effect is a nonlinear effect found in the interaction process between light and material
For the purpose of comparing the theoretical and finite difference time difference (FDTD) analysis, we investigate a comparison of the EIT like transmission effect between the theory and FDTD simulations
We have presented a new method for the generation of the EIT effect based on coupled 3 × 3
Summary
The electromagnetically induced transparency (EIT) effect is a nonlinear effect found in the interaction process between light and material. Only 2 × 2 directional coupler was used for microring resonator based on the EIT effects [25] Such structure is very sensitive to the fabrication. By using the MMIs, we can overcome the disadvantages of devices based on directional couplers such as compactness, ease of fabrication and large fabrication tolerance [27] One of such structures is a 3 × 3 MMI based microring resonator. The Fano resonance system created by 3 × 3 MMI coupler based microring resonator in Figure 1 can be expressed by the coupled mode equations [38]. We. We use the BPM to investigate microring resonators the effect of the MMI length on the phase sensitivity.
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