December 20, 2022 at 5:14 pm
December 20, 2022 at 5:51 pmGuilin SunAnsys Employee
It might indicate that there is gain in the system. Please check the component input data and make sure they are passive.
December 20, 2022 at 6:22 pmdubeySubscriber
I am using the above example as reference. Could you please explain why we need to find Delta_neff in step 4. Cant we use just neff data calculated from the mode solver?
December 20, 2022 at 7:19 pmGuilin SunAnsys Employee
What modification did you do for the script andsimulation file?
When you have more voltage points, make sure the raw data has that voltage. Otherwise, the data will be interpolated, and errors can happen.
I also tested positive voltage and they worked well. Then I tested 1.5,2.5 and 3.5V and the result has no positive result.
Please test/check the individual voltage and see if the data has gain.
December 20, 2022 at 7:37 pmdubeySubscriber
I have replaced dneff table in modulator element by the one generated for integrated graphene layer. Also, I replaced active and passive waveguide as per my own structure but with same bent radius and wavelength range. I can share all three files if needed. I am using the CE table that was included in the table.
December 20, 2022 at 8:22 pmGuilin SunAnsys Employee
This indicates some data are wrong in your file. Please only simulate at -10v, and verify its data. Unfortunately we are not able to help for a specific issue other than general, and we are not allowed to download customer files in the forum.
December 22, 2022 at 3:12 pmdubeySubscriber
Hi, Thank you for your comments!
If I use table of neff in the example, I am getting a transmission curve without any gain (see attached graph), even at higher bias voltage. Although, the peak transmission loss is around -8dB only. Could please explain briefly why there is need to find complex dn eff results as a function of voltage in Delta_neff.txt. (step 4 line 6) in this example?. Is the result would be correct If I just use the neff value?
December 22, 2022 at 3:32 pmGuilin SunAnsys Employee
When the charges cause index change, it also introduces absorption. this is why the index pertubation is complex.
It seems your device needs higher voltage to get large dB dip. Please careffully check your data.
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