January 4, 2023 at 2:54 amzuoyandaoyingSubscriber
I am trying to simulate the ring resonator at 2D simulation now， and image 1 is the size and g=0.2um.
I followed the sample of another group, I chose the simulation time at 15000, auto shutoff min 1e-10, PML layer 40.
But the problem is that the result of transmission is already more than 1(final image).
so if anybody can give me the answer, thank you very much!
January 4, 2023 at 2:55 am
January 4, 2023 at 7:20 pmGuilin SunAnsys Employee
From the 2nd screenshot, both the left waveguides are ended in the background material, which is not good. You should reduce the FDTD X min to include both waveguides, eg, extend the waveguides to outside of PML, like in the right side. Otherwise they will cause reflection.
In addition, since you have used very small autoshutoff min, you should use much longer simulation time, say 100 times to the current setting, and let the autoshutoff min to terminate the simulation.
Not running long enough or too large the autoshutoff min is the main cause of such issue. Please refer
January 5, 2023 at 9:19 amzuoyandaoyingSubscriber
Thanks for your information！Professor Sun.
Today I already change some conditions that you have suggested. Such as extending the waveguides outside of PML, auto shutoff min=1e-15
simulation time = 30000
But the result is still more than 1. I am confused about it. So could you please give me another suggestion? thank you very much!
January 5, 2023 at 4:56 pmGuilin SunAnsys Employee
Obviously, the simulation time is not long enough! it terminated at 100%. You will need to set the simulation time to be 100 times more than your current setting, and let the autoshutoff min to terminate it. the Autoshutoff min 1e-15 is too small. I would suggest to use 1e-6, or 1e-7. Please try.
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- “Import optical generation” or “delta generation rate”?
- Why am I getting “process exited without calling finalize”, and how do I fix it?
- Error on Lumerical device
- Using a license file on a new license server
- Error: addfdtd is not a valid function or a variable name
- Ansys Insight: Diverging Simulations
- Ansys Insight: Transmission results greater than one
- Ansys Insight: About override mesh in FDTD: its use and settings
- Ansys Insight: Convergence issues in CHARGE
- Is there a Lumerical script command to output the Simulation and Memory requirements?
© 2023 Copyright ANSYS, Inc. All rights reserved.