Comments (6)
Few inputs here, if you find the correct eigenmode with all full vectorial components, Ex,Ey,Hx,Hy, and launch with those, there are no theoretical reflections and directivity comes naturally. The eigenmode calculation error can result in mismatch. However, there is also a limit on any FDTD/FDFD code based on settings used like acceleration parameters and 16bit/32bit/64bit processing and scaling to not run out of bits. This can be tested by placing a straight single-mode waveguide and running it and simulating loss vs. waveguide length, looking at absorption in PML boundaries vs. what is launched. The goal should be within an error of better than -40dB in transmission and reflection. If you want to learn about these limits, I suggest this book;
"Computational Electrodynamics: The Finite-Difference Time-Domain Method, Alan Taflove"
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With the current way, we just define the field in a certain location. So to be very correct, it's not a source and thus there's no directionality.
I'd guess that's okay, as we could also put it close to a PML and just absorb whatever goes in the other direction.
We could measure the power in the modes at the ports by calculating overlap integrals, right?
The main problem I have at the moment in my understanding is how we would calculate back reflection. but maybe we could solve that by calculating an overlap integral before and after the position where we set the field?
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could we somehow "normalize" the source/input field by computing its flux or field profile near the position where the source/field is set in a simple waveguide geometry, and attribute deviations from that in more complicated structures to reflections?
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This looks like what they might be doing here http://hade.ch/docs/report_FDFD.pdf, see Fig 3 and explanation in text. I'm not sure how you can plot both an incident and reflected wave from one simulation where both would be superposed
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thanks @timurdogan ! looks like a great ressource! I'll start with the waveguide example
I've done first steps in #59, mostly docs and a simple waveguide example, but more to come
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Related Issues (20)
- Calculation of effective mode area or nonlinear coefficent HOT 13
- efficient wide sweeps for waveguide dispersion HOT 2
- mode solver neff jumps HOT 6
- treating quasi-TE mode in overlap with the mode of an optical fiber HOT 1
- Capillary waveguide help HOT 14
- incorrect neff in long wavelength HOT 10
- Calculation of effective area for Spontaneous Four-wave Mixing (SFWM) HOT 3
- Possible issue with modes / overlap integrals in complex systems HOT 1
- Example to reproduce
- Add symmetry planes for simulation to filter TE and TM for optics, or even and odd modes for RF HOT 3
- mesh_from_Dict does not handle MultiLineStrings() HOT 4
- Plasmonic waveguide example HOT 3
- Improvements on RF waveguide design tutorial HOT 15
- Failed Import of compute_modes with new install HOT 1
- plot abs part from component has issues
- add logscale to plot
- missing reference HOT 2
- Windows installation of femwell HOT 3
- How to Install the Julia version of femwell HOT 6
- Adjust propagation loss example to paper
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