Hi WENKAI YANG,
Thank you for the post. You will need to set some properties in the waveguides and couplers. Please refer to this page the "Important model settings" section: https://optics.ansys.com/hc/en-us/articles/360042329094-Ring-modulator-time-domain-INTERCONNECT-. Here are also some settings and explanations on the time domain setting and verification:
https://optics.ansys.com/hc/en-us/articles/360045467713-Time-Domain-Simulations-Time-Domain-Simulation-Setup-Sources
https://optics.ansys.com/hc/en-us/articles/360045467633-Time-Domain-Simulations-Introduction-to-INTERCONNECT-Time-Domain-Simulations
You are navigating away from the AIS Discovery experience