Thermo-Optic Multi-Stability and Relaxation in Silicon Microring Resonators with Lateral Diodes was published on Phys. Rev. Applied
- Quantum and Nonlinear Optics
Title: Thermo-Optic Multi-Stability and Relaxation in Silicon Microring Resonators with Lateral Diodes [Phys. Rev. Applied, arXiv, PDF]
Authors: Dodd Gray, Ryan Hamerly, Meysam Namdari, Mircea-Traian Cătuneau, Nate Bogdanowicz, Hideo Mabuchi, Kambiz Jamshidi
Published on 25 August 2020.
Abstract: We demonstrate voltage-tunable thermo-optic bi- and tri-stability in silicon photonic microring resonators with lateral p-i-n junctions and present a technique for characterizing the thermo-optic transient response of integrated optical resonators. Our method for thermo-optic transient response measurement is applicable to any integrated photonics platform and uses standard equipment. Thermo-optic relaxation in encapsulated waveguides is found to be approximately logarithmic in time, consistent with the analytic solution for 2D heat diffusion. We develop a model for thermo-optic microring multi-stability and dynamics which agrees with experiment data over a wide range of operating conditions. Our work highlights the fundamental connection in semiconductor waveguides between active free-carrier removal and thermo-optic heating, a result of particular relevance to Kerr soliton state stability and on-chip frequency comb generation. The devices studied here were fabricated in a CMOS foundry process and as a result our model is useful for design of silicon photonic waveguide devices..
