Reply To: MODE: Strange mode result from FDE solver

[Henrick Höllerer]

 

Hello Amrita,

thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings.

For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan = 4.8 microns for a (bent) waveguide of width = 800nm, height = 600nm and bent radius of 100 micron. The default mesh has a max. stepsize of 20nm. Around the waveguide I used an override mesh with a max. step size of 5nm.

Without changing anything – just re-running the exact same simulation as above – I can also obtain this (correct) result:

So, doing a parameter sweep is possible, but not helpful as these unphysical results happen randomly and are just outliers of an otherwise converging curve.
I am running this simulation on a computational server of my university. I was wondering if this behaviour could be caused by the computational resource management of Lumerical and the server. 

Best regards,
Henrick