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Coupling coefficient between waveguide (directional coupler example)

Posted Nov 25, 2023, 12:00 a.m. EST Electromagnetics, Wave Optics 2 Replies

Govind Kumar
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I am trying to calculate coupling coeffcient between the waveguide for the example (directinal coupler.mph ) given in comsol application libarary. Can anyone help me how can i calculate coupling coefficient as shown in the following paper [](http://www.mdpi.com/2304-6732/9/2/63 -- Thank you -- Govind

2 Replies Last Post Feb 16, 2024, 4:47 a.m. EST
Robert Koslover Certified Consultant
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Posted: 11 months ago Nov 25, 2023, 10:04 p.m. EST
Updated: 11 months ago Nov 25, 2023, 9:55 p.m. EST

Is this the model to which you are referring? It is in the Application Gallery (not to be confused with the Application Library). https://www.comsol.com/model/directional-coupler-14593 . You can find an accompanying .pdf file that helps explain that model at: https://www.comsol.com/model/download/1259021/models.woptics.directional_coupler.pdf .

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Is this the model to which you are referring? It is in the *Application Gallery* (not to be confused with the *Application Library*). **https://www.comsol.com/model/directional-coupler-14593** . You can find an accompanying .pdf file that helps explain that model at: **https://www.comsol.com/model/download/1259021/models.woptics.directional_coupler.pdf** .
Govind Kumar
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Posted: 9 months ago Feb 16, 2024, 4:47 a.m. EST

Hi..Robert Koslover, I am sorry for late reply. Actually, I was trying to calculate the cross-talk between two core in above example [https://www.comsol.com/model/directional-coupler-14593]. I can calcuate it by using couple mode theory by calucting E field for one (or another) core taking other core absent and calculating the overlapp integral. But I could not do it by using supermode thery as discussed in the following paper. [(http://opg.optica.org/ol/fulltext.cfm?uri=ol-41-16-3759&id=348251)]. In above example, it was shown that how the electric field couples from one waveguide to other, but it was not ediscussed how can be extract the coupling coeffcient/cross -talk between the two core.

Hi..Robert Koslover, I am sorry for late reply. Actually, I was trying to calculate the cross-talk between two core in above example [https://www.comsol.com/model/directional-coupler-14593]. I can calcuate it by using couple mode theory by calucting E field for one (or another) core taking other core absent and calculating the overlapp integral. But I could not do it by using supermode thery as discussed in the following paper. [(http://opg.optica.org/ol/fulltext.cfm?uri=ol-41-16-3759&id=348251)]. In above example, it was shown that how the electric field couples from one waveguide to other, but it was not ediscussed how can be extract the coupling coeffcient/cross -talk between the two core.

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