May 25, 2023 at 12:25 pmjasperSubscriber
I am trying to simulate a Distributed Bragg Reflector that is optimized for maximum reflectance at 1550nm. I have checked the simulation geometry and it seems to be correct, so I am wondering about other causes of such a low reflectance. (It should be around 1.) Are there any simulation settings that I might have overlooked, causing this behaviour?
Please let me know if you need more input.
Thanks in advance!
May 25, 2023 at 5:41 pmAmrita PatiAnsys Employee
What type of source are you using?
May 31, 2023 at 5:38 amjasperSubscriber
I am using the fundamental TE Modes from the EME port as my source. I have also tried using the fundamental TM Mode and both, but all give too low reflectivity. The DBR is designed to only carry the fundamental TE and TM modes.
June 1, 2023 at 11:42 amjasperSubscriber
I have also noticed that the mode convergence sweep doesn't converge (when using conserve energy):
Interestingly, here (“CVCS” or “none” for the taper waveguide coupler (ansys.com)) it is recommended to make energy conservation passive, whereas here (EME solver - Simulation object – Ansys Optics) it is mentioned that energy conservation should be enabled when simulating a periodic structure. So which option should I use?
June 1, 2023 at 5:35 pmAmrita PatiAnsys Employee
CVCS is used for structures whose transverse cross-sections vary continuously like a taper. Would you be able to share screenshots of your geometry and the EME setup tab? Like you mentioned, since it is a periodic structure I would suggest you to keep the energy conservation option as "conserve energy".
June 2, 2023 at 9:23 am
June 2, 2023 at 9:54 amjasperSubscriber
Got it fixed after using custom eigensolver settings: For cell 1 (The single mode waveguide section), only use 2 modes.
- The topic ‘Reflectivity of DBR too low’ is closed to new replies.
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