I am using Rsoft Beamprob CAD tool to simulate annealed proton exchange waveguide in MgO doped lithium niobate. However, I am having difficulty in defining diffusion parameters such as diffusion coefficient, initial concentration, annealing time, diffusion temperature among others in global parameters dialog box so as to achieve the desired channel waveguide. Can someone give advice on how I can go about this or give an example of such two step diffusion process. I will appreciate your feedback. Thank you.
I suspect your best bet would be to separately simulate the Refractive Index (RIX) profile of the waveguides using some other tool (for example, Python/Matlab code to extrapolate the RIX along a typical diffusion profile).
Then code up the RSoft CAD with just that RIX profile - maybe with a diffused WG model if they have that, or just a MultiLayer model with many small discrete layers intended to emulate the continuous diffusion profile.
Thus your anneal/concentration/diffusion params end up in your first tool, which generates the RIX profile to go into RSoft.
If I remember corrcetly, you could even have your diffusion tool output a file which RSoft could just read as the Index Profile. I know I've done that with modes (had a Python simulation output RSoft *.m00 mode files) for launching into a simulation, I haven't personally done it with RIX profiles but I suspect it's not that hard to do. Probably similar syntax in the file.
A lot of thanks John. Probably I will use MATLAB for diffusion though I would prefer mathcad if it has such output. Yes, Rsoft has diffusion profile!
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