July 12, 2023 at 4:37 amAltair45Subscriber
I am working with Lumerical FDTD for the calculation of a coupled-resonator optical waveguide with Bragg grating. I am trying to extract the transmission and compare the data with the reference data as both are attached below. In this comparison, I'd like to match the reflection intensity from ~ -45dB to ~ -100dB like the reference. To do like this, what should I check the setting value or parameters in the FDTD simulation?
First image is the motivated design in my FDTD simulation and second is my transmission data, and the last is reference data (Han, Changhao, et al. "Slow light silicon modulator beyond 110 GHz bandwidth." arXiv preprint arXiv:2302.03652 (2023).)
I would appreciate any help and advice,
Thanks in advance
Kang Seok Kim
July 13, 2023 at 12:20 amGuilin SunAnsys Employee
This will need long simulation time, smaller autshotoff min, and proper PML settings, such as number of PML layers (in total about half wavelength thick). As you can see from your result, it has ripples, which indicates the actual simulation time is not long enough.
Oce the curve is smooth, then you will need to use finer mesh, and keep PML away (half wavelength) from grating teeth.
There are some fine-tuning works to be done.
Please check this post for comparison:
Accurate frequency-domain result will need sufficient time and smaller autoshutoff min , as well as higher mesh accuracy, low PML reflection etc.
July 13, 2023 at 12:40 amAltair45Subscriber
Thank you for your help. Following your advice, I have just set the value rightly now.
July 16, 2023 at 3:05 amliyaqianSubscriber
Hello, did you use FDTD to simulate the entire 124um device? What's the duty cycle? Thanks!
July 17, 2023 at 2:01 amAltair45Subscriber
Hello, while the duty cycle is not mentioned in this reference, I set the duty cycle to 0.5 arbitrarily. Thanks
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
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?
- Using a license file on a new license server
- Ansys Insight: Diverging Simulations
- Error: addfdtd is not a valid function or a variable name
- Error on Lumerical device
- Questions about the calculation of the cross-polarization conversion efficiency of metasurface
- Ansys Insight: About override mesh in FDTD: its use and settings
- Finding your Ansys (or Lumerical) account number
- Lumerical – error message when trying to open from Linux terminal
© 2023 Copyright ANSYS, Inc. All rights reserved.