Menu

Discussion Forum

New Discussion
查找

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

3D optical waveguide error

Posted 2013年6月10日 GMT-4 02:53 RF & Microwave Engineering, Wave Optics Version 4.3b 6 Replies

Mark Daly
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello everyone,

What I'm trying to do is basically simulate an optical fiber in 3D. I thought it would be a simple task but I'm running into an error.

I created an optical fibre with an air cladding. The fiber is very thin (.5 um radius).

I thought all I would have to do was create an input port and and exit port, perform a boundary mode analysis on both ports and then add the frequency domain study.
When I do this i get the following error:

Undefined value found.
- Detail: NaN or Inf found when solving linear system using SOR.

Does anyone know what I am doing wrong? Any input would be greatly appreciated.

Thank you,
Mark
6 Replies Last Post 2013年7月9日 GMT-4 03:32
Abutaleb Haidary
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年6月10日 GMT-4 12:47
Hi,
Which kind of excitation port you are using for this 3D model?
Hi, Which kind of excitation port you are using for this 3D model?
Mark Daly
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年6月11日 GMT-4 01:43
I'm using a numeric port. Should I try a user defined port?
I'm using a numeric port. Should I try a user defined port?
Mark Daly
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年6月18日 GMT-4 00:30
Is there any way to solve for a field in a 2D model and then import that solution into the 3D model for the boundary mode analysis and then see how it propagates in the 3D model?
Is there any way to solve for a field in a 2D model and then import that solution into the 3D model for the boundary mode analysis and then see how it propagates in the 3D model?
Mark Daly
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年6月19日 GMT-4 05:28
One last question. I hope someone will answer :)

In the 2D model of a circular optical fiber you can see the modes present. If I make a 3D fiber and only perform a single boundary mode analysis on one input should I be able re recreate the 2D models results? I've tried this with no luck thus far.

Thanks,
Mark
One last question. I hope someone will answer :) In the 2D model of a circular optical fiber you can see the modes present. If I make a 3D fiber and only perform a single boundary mode analysis on one input should I be able re recreate the 2D models results? I've tried this with no luck thus far. Thanks, Mark
Mark Daly
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年7月9日 GMT-4 00:52
Hello again,

I've updated to 4.3b and I'm trying a similar model. I think what I have should work but I can't get it to compile.

Could someone take a look at my model and see if there are any obvious mistakes? The solver gets to about 70% but then it stalls for a long time. I think my mesh is correct.

Any advice is welcome!

Mark.
Hello again, I've updated to 4.3b and I'm trying a similar model. I think what I have should work but I can't get it to compile. Could someone take a look at my model and see if there are any obvious mistakes? The solver gets to about 70% but then it stalls for a long time. I think my mesh is correct. Any advice is welcome! Mark.
Stefano Firpi
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2013年7月9日 GMT-4 03:32
Here is my two cents.
Don't have the RF module so I can't take a look at your model but if the solver stalls, it means there are convergence issues; as the model is quite simple (or it should be) this means something is wrong with the physics.

Here is my two cents. Don't have the RF module so I can't take a look at your model but if the solver stalls, it means there are convergence issues; as the model is quite simple (or it should be) this means something is wrong with the physics.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content