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Effective mode area

Posted Jan 1, 2010, 6:57 p.m. EST RF & Microwave Engineering Version 3.5a, Version 4.4, Version 5.0, Version 5.1 4 Replies

Ke Wang
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Does anyone know how to caculate the effective mode area of the fundemental mode in an optical fiber using COMSOL 3.5?
4 Replies Last Post Nov 4, 2015, 8:57 a.m. EST
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Hello Ke Wang

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Pengfei Yang
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Posted: 1 decade ago Nov 21, 2011, 11:46 a.m. EST
Have u slove the problem? I have the same question.

Good luck
Have u slove the problem? I have the same question. Good luck
Micke Malmström
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Posted: 9 years ago Nov 4, 2015, 7:58 a.m. EST
Reviving this thread!

Does anyone know the answer?

If I plot the cut line through the center is there a a simple way of extracting the 1/e width and exporting into a table from that graph?
Reviving this thread! Does anyone know the answer? If I plot the cut line through the center is there a a simple way of extracting the 1/e width and exporting into a table from that graph?
Micke Malmström
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Posted: 9 years ago Nov 4, 2015, 8:42 a.m. EST
Acording to www.rp-photonics.com/effective_mode_area.html

A_eff= int I dxdy / int I^2 dxdy

Which means that using two Derived values" i.e. the integrals of emw.Poavz and emw.Poavz^2 and deciding one by the other the answer is achieved.

However the two values end up in two different tables and I can not plot one table divided by the other. So Ig guess I have to store the sol in tables on file import to matlab perform the division and then export to a similar table on file that then can be plotted...
Acording to https://www.rp-photonics.com/effective_mode_area.html A_eff= int I dxdy / int I^2 dxdy Which means that using two Derived values" i.e. the integrals of emw.Poavz and emw.Poavz^2 and deciding one by the other the answer is achieved. However the two values end up in two different tables and I can not plot one table divided by the other. So Ig guess I have to store the sol in tables on file import to matlab perform the division and then export to a similar table on file that then can be plotted...
Jeff Hiller COMSOL Employee

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Posted: 9 years ago Nov 4, 2015, 8:57 a.m. EST
Hello Micke,
You could use Component Couplings of the Integration type to compute the integrals. This way each integral has a name and you can divide one by the other within COMSOL. Use "Update Solution" to evalaute the component couplings without having to recompute the solution.
Best,
Jeff
Hello Micke, You could use Component Couplings of the Integration type to compute the integrals. This way each integral has a name and you can divide one by the other within COMSOL. Use "Update Solution" to evalaute the component couplings without having to recompute the solution. Best, Jeff

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