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coupling coefficient of ring resonator

Posted 29 gen 2025, 04:54 CET 1 Reply

Omnia Nawwar
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Hi all,

I am trying to calculate the coupling coefficient of ring resonator with a straight waveguide. I constructed the physical structure but still do not know how to apply the equation of coupling coefficient to get the value. i attached the equations.

Any help with that

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1 Reply Last Post 29 gen 2025, 23:54 CET
David Greve
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Posted: 6 months ago 29 gen 2025, 23:54 CET

It looks like you need to do an eigenmode simulation to find the ring mode and then a volume integral after writing out the components of the dot product. In other words, not easy although I believe it can be done within Comsol. Don't forget that the ring mode and waveguide modes will need appropriate normalization.

I wonder if there isn't an easier way? Maybe using incident and stored energies??

It looks like you need to do an eigenmode simulation to find the ring mode and then a volume integral after writing out the components of the dot product. In other words, not easy although I believe it can be done within Comsol. Don't forget that the ring mode and waveguide modes will need appropriate normalization. I wonder if there isn't an easier way? Maybe using incident and stored energies??

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