Chinese Optics Letters, Vol. 18, Issue 1, 013601 (2020)
A controllable coupling structure for silicon microring resonators based on adiabatic elimination
Fenghe Yang1,2,3, Pengfei Sun1,3, Ruixuan Chen1,3, and Zhiping Zhou1,2,3,*
- 1State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
- 2Peking University Shenzhen Research Institute, Shenzhen 518057, China
- 3Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing 100871, China
Optical microring resonators are extensively employed in a wide range of physical studies and applications due to the resonance enhancement property. Incorporating coupling control of a microring resonator is necessary in many scenarios, but modifications are essentially added to the resonator and impair the capability of optical enhancement. Here, we propose a flexible coupling structure based on adiabatic elimination that allows low-loss active coupling control without any modifications to the resonators. The self-coupling coefficient can be monotonically or non-monotonically controllable by the proposed coupler, potentially at a high speed. The characteristic of the coupler when implemented in silicon microring resonators is investigated in detail using substantiated analytical theory and experiments. This work provides a general method in coupling control while ensuring the resonance enhancement property, making active coupling control in a resonator-waveguide system feasible.
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