Photonics

Photonics

Topics related to Lumerical and more.

Convergence testing for modes number in EME

    • x.li4
      Subscriber

      Hi,

      I am using EME to simulate Bragg garing. The problem is when I use different modes number, the results are very different. So I tried to use convergence test for modes number. But the results I got seems very weird shown below. It shows no trend here. Could you give me some suggestions on how to adjust other parameters to make results more feasible.

      kind regards,

      Xiao

    • anna.wirth-singh
      Ansys Employee

      Hi Xiao,

      I am sorry to hear that you are having issues with EME. Possibly the issue is not the number of modes but some other setting. I would first suspect the number of cells or that the cells correspond to your structure correctly; have you tried convergence testing for the number of cells as well? The cell properties can be adjusted in the EME solver properties: 

      Secondly, unexpected results can occur if the simulation boundaries are too close to the strucutre. Especially if you are using PML, please check that the boundaries are at least half a wavelength away from the structure. 

      It may also be worth checking for any material fitting issues because that can cause unexpected results. 

      We do have an example in the App Gallery for simulating a Bragg grating with EME: Bragg Grating full device simulation with EME – Ansys Optics. If you used this as your starting point, would it be possible to describe the changes you have made to adapt the simulation to your model?

      I can also share these related links about convergence testing in EME:

      I hope this information is helpful. Please reply back if you can provide any further information about your simulation setup that may help diagnose the issue. 

      Best,

      Anna

       

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