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Graded Index Waveguide
Posted 29 août 2014, 08:36 UTC−4 RF & Microwave Engineering Version 4.4 1 Reply
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Hi all,
I'm trying to model a graded Index Waveguide (for instance a diffused waeguide) in Comsol 4.4.
I'm was more familiar with Comsol 3.5 where I could enter the expression for my graded index profile and then simulate my modes.
I've tried to do the same thing in 4.4 defining a new material and entering the expression in the refractive Index tab.
But I can see that it doesn't work.
Do you have any clue on how to do it?
Moreover is there any way to open the file generated with 3.5?
Thank you.
Best,
Domenico
I'm trying to model a graded Index Waveguide (for instance a diffused waeguide) in Comsol 4.4.
I'm was more familiar with Comsol 3.5 where I could enter the expression for my graded index profile and then simulate my modes.
I've tried to do the same thing in 4.4 defining a new material and entering the expression in the refractive Index tab.
But I can see that it doesn't work.
Do you have any clue on how to do it?
Moreover is there any way to open the file generated with 3.5?
Thank you.
Best,
Domenico
1 Reply Last Post 2 sept. 2014, 04:29 UTC−4
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Posted:
1 decade ago
I don't know if can be of any help but I solved the problem and now I'm able to compute the mode of my graded index waveguide.
What I did was: defining an analitic function in the material node.
ex. index= erfc(Wx[1/um]-x)+erf(Wx[1/um]+x)*exp(-(y/D[1/um])^2) with arguments x,y
I noted that if I don't put [1/um] it doesn't work.
Then in the refractive index property tab I've entered index(x,y).
Done
What I did was: defining an analitic function in the material node.
ex. index= erfc(Wx[1/um]-x)+erf(Wx[1/um]+x)*exp(-(y/D[1/um])^2) with arguments x,y
I noted that if I don't put [1/um] it doesn't work.
Then in the refractive index property tab I've entered index(x,y).
Done