April 3, 2023 at 4:40 pmvdhurgude3Subscriber
Can someone create a post or an article for photonic nanotaper simulation?
April 4, 2023 at 9:11 pmGuilin SunAnsys Employee
You can write a post for ay questions, or if you have peers with same interest, you may create a Forum Feed and invite them for discussion.
For tapers, we have examples online:
Polarization converter using a tapered waveguide
Curved waveguide taper (varFDTD and FDTD)
Please indicate which solver you are using and what the problem you have.
April 24, 2023 at 1:20 pmvdhurgude3Subscriber
I have a doubt about taper simulation. I am doing 3D FDTD simulation, should I use mode source or Gaussian Beam source. With mode source I get high efficiency as compared to Gaussian Beam source. What is the correct source?
May 1, 2023 at 4:36 pmGuilin SunAnsys Employee
Taper is a waveguade. It is nature to use mode source, or port which has all necessary monitors. Please note that you need PML to truncate the taper, or other input/output waveguide to avoid limited length taper which is a cavity and has reflections.
You can also use EME, which is easily optimize the taper length.
May 1, 2023 at 8:45 pmvdhurgude3Subscriber
Thanks for your reply. Actually, the taper i designed is nanotaper. One end has extremely small width and another end has a waveguide width. My goal is to do edge coupling from fiber to the smaller end of the taper. I used gaussian source to create mode profile coming out of the the fiber tip. With gaussian source my efficiency is extremely low. With mode source transmission efficiency is around 80%. So please guide correctly with existing examples for taper design
May 2, 2023 at 4:26 pmGuilin SunAnsys Employee
Then you should use the fiber mode. I guess it might be due to polarization mis-match with Gaussian. In addition, Gaussian beam is an approximation of the fiber mode. If the fiber is too large to be included in the simulation, you can first simulate the fiber mode and record data (most likely in air or a uniform material) and then import it as source for edge coupling. However, it eliminates the possible reflection from the fiber end surface, which should be small.
May 2, 2023 at 4:31 pmvdhurgude3Subscriber
Thanks for your reply. Before doing FDTD simulation, I did fiber to waveguide edge coupling. From fiber to taper end edge coupling, I get efficiency of 90% between TM mode of fiber and first TM mode of the taper end.
So for FDTD simulation, should I take mode source into account with first TM mode simulation at the start of the taper rather taking Gaussian source? Will it be a correct approach?
May 2, 2023 at 11:42 pmGuilin SunAnsys Employee
Is there any gap between the fiber and the edge coupler?
a mode can only be supported inside a waveguide or fiber.
If the field needs a certain propagation distance before coupling, you can use the import source from the first simulation. If they are end-to-end coupling without gap, it is better to have the fiber in the simulation.
I do not know the configuration of your device so just give you some general suggestions.
- 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.
- Why am I getting “process exited without calling finalize”, and how do I fix it?
- “Import optical generation” or “delta generation rate”?
- Error: addfdtd is not a valid function or a variable name
- Error on Lumerical device
- Using a license file on a new license server
- Ansys Insight: Transmission results greater than one
- Ansys Insight: Diverging Simulations
- Finding your Ansys (or Lumerical) account number
- Is there a Lumerical script command to output the Simulation and Memory requirements?
- Ansys Insight: Why my simulation result is different from published paper or experiment?
© 2023 Copyright ANSYS, Inc. All rights reserved.