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Failed to evaluate variable Jacobian

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hi,

I tried to find the modes of a ridge waveguide, but comsol said he failed to evaluate variable Jacobian.
I think the problem is that i have a function that changes the refractive index of one of the layers.

How can I solve the problem?


1 Reply Last Post 6 déc. 2011, 14:55 UTC−5

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Posted: 1 decade ago 6 déc. 2011, 14:55 UTC−5
I see 2 problems in your model:
1. Delete argument of your function, "[m]".
2. To refer to your function, you need to use proper argument. For example, "index(13.5e-9)"
If you make these two changes the error will disappear.

P.S.: your meshing is really bad. Start meshing the structure from the thinnest layer.
I see 2 problems in your model: 1. Delete argument of your function, "[m]". 2. To refer to your function, you need to use proper argument. For example, "index(13.5e-9)" If you make these two changes the error will disappear. P.S.: your meshing is really bad. Start meshing the structure from the thinnest layer.

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