I saw your comment and decided to check out your channel. Very nice simulation! For my next video I reached out to Nils again and we made a simulation that is in some ways quite similar to the one you made here with the lens and the apertures.
3:56 multimode propagation does completely not delay the wavefront but disperses it over a longer time period. The more direct mode will arrive at the same time as in the single mode case. The delay shown is also inconsistent with the earlier examples of varying fiber diameter, which should show the same effect in multimode propagation.
Thank you. I believe single mode fibers have lower loss and mode dispersion over long distances, while working with multimode fibers generally requires less tight tolerances for coupling light in and out of the fiber. I can recommend watching 'Fiberoptics Fundamentals | MIT Understanding Lasers and Fiberoptics' ( th-cam.com/video/0DCrIAxEv_Y/w-d-xo.html ) for more information on the subject.
Thanks for this cool video and simulation program. Have you benchmarked the WaveSimulator2D against any other physical simulator? Can it be used for scientific (physically accurate) simulations with any degree of confidence? Many thanks.
Hey, do you think you could make a tutorial on using the wave simulator code for the less CS savvy among us? I’d love to mess around with it but I dont know how to use it. I’m disabled at software 😅
If you're interested in ideas for related videos, a look at how (e.g. digital signal) edges degrade in MMF would be very nice! At some point all you get is mush, modal bandwidth is a serious pain :)
Despite being a 2D simulation, I think its quite accurate. The field has to penetrates the outer medium (with lower diffractive index) to be guided. The presence of this 'evanescent field' is a well known effect that occurs with total internal relfection.
I saw your comment and decided to check out your channel. Very nice simulation! For my next video I reached out to Nils again and we made a simulation that is in some ways quite similar to the one you made here with the lens and the apertures.
I am looking foreward to it. Anyway if you need something feel free to stop bye.
@@DiffractionLimited after seeing huygen's video i m here becoming the 69th subscriber nice.
@@DiffractionLimited also here thanks to @HuygensOptics and your wonderful simulations!
3:56 multimode propagation does completely not delay the wavefront but disperses it over a longer time period. The more direct mode will arrive at the same time as in the single mode case. The delay shown is also inconsistent with the earlier examples of varying fiber diameter, which should show the same effect in multimode propagation.
Very cool looking simulations, I'd love to hear what the benefits and drawbacks of these different operating regimes are.
Thank you. I believe single mode fibers have lower loss and mode dispersion over long distances, while working with multimode fibers generally requires less tight tolerances for coupling light in and out of the fiber. I can recommend watching 'Fiberoptics Fundamentals | MIT Understanding Lasers and Fiberoptics' ( th-cam.com/video/0DCrIAxEv_Y/w-d-xo.html ) for more information on the subject.
Thanks for this cool video and simulation program. Have you benchmarked the WaveSimulator2D against any other physical simulator? Can it be used for scientific (physically accurate) simulations with any degree of confidence? Many thanks.
Freakin sick!
audio bug at 1:11?
Hey, do you think you could make a tutorial on using the wave simulator code for the less CS savvy among us? I’d love to mess around with it but I dont know how to use it. I’m disabled at software 😅
Yes I would like to, but I am currently a bit too busy with other projects/work and I still have to finish a half way done air-bearing video first.
Could this wave diffraction simulator be also applied to soundwaves and sonar?
In principle yes (unless your medium has some non-linear effects on the wave). However the simulation is 2D, so it depends on what you want to do.
If you're interested in ideas for related videos, a look at how (e.g. digital signal) edges degrade in MMF would be very nice! At some point all you get is mush, modal bandwidth is a serious pain :)
Great Idea, thank you. I have put it on my 'TODO-List' :)
How physical is the leakage in the vicinity of the outer edge of the fibers in the simulation?
Despite being a 2D simulation, I think its quite accurate. The field has to penetrates the outer medium (with lower diffractive index) to be guided. The presence of this 'evanescent field' is a well known effect that occurs with total internal relfection.