Waveguides Explained

/ edmundsj
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What is a waveguide and why is everybody talking about them? This video will explore the fundamental reasons behind the use of waveguides, which include acoustic, RF, and optical guides. They all operate on fundamentally the same principle - they confine waves to a small region of space and allow low power loss over large distances. I also explain how they are analyzed (in terms of the input frequency), and the critical concepts of the 'shape' of light, as well as dispersion in a waveguide.
This is part of my graduate series on optoelectronics / photonics, and is based primarily on Coldren's book on Lasers as well as graduate-level coursework I have taken in the EECS department at UC Berkeley.
Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.

[@joemoukawam7034]

Thank you sir this was extremely helpful , because before tackling any subject , I shall know the reason why it's useful, and this made it happen

[@JordanEdmundsEECS]

^ This comment. I love this comment. It provides useful, specific feedback I can use in the future. Thank you for adding value to this KZbin channel :)

[@QuantumGirl24]

So, I am someone who graduated from college in 2019, and now I am back in masters after almost 5 years, I must say I really really wish I had access to such wonderful content and resources back when I was in school and in early years of my undergrad. This is pure gold.

[@agale652]

One of the best simple demonstrations on this topic. Well done and thank you.

[@abhaypillai970]

Did he just explained it better than Mr. Feynman himself. I truly appreciate it. I was looking up in Feynman lectures to understand waveguides, a bit confused and searched on KZbin to find yours. And it's incredible.

[@sonusarraf1663]

Jordan your videos are just amazing both contentwise and presentationwise!

[@peterkay7458]

Really excellent Jordan, clear concise and to the point much appreciated.

[@leithrogers3412]

Holy cow this video is amazing. Thank you so much

[@snigdhachandratre1785]

Great video! For the first time, I understood what mode profile means. Thank you 🙂

[@sernuryldz8155]

This was a very helpful video while I was trying to understand zero-mode waveguide technology. Really nice analogy! Thank you so much

[@a24396]

Thanks so much for the explanation. I find it really useful to learn a concept before math gets involved and I then learn the specific formula(s) involved.

[@athirahsyamimi4943]

I'm also new in photonics, I did my undergrad project about tapered fiber, and now i'm pursuing my studies in Bath, UK, also in the same field. You helped me alot in understanding the real concept of waveguide. Thank you so much!

[@JordanEdmundsEECS]

Neat :D glad to hear I could be of assistance. Best of luck in your studies!

[@briankamras2913]

This is a godsend for me. Please make more videos.

[@Vikashjnv]

Thank you very much sir after visiting many channels finally i got the real one from which i understood that what mode profile is

[@rosarionapoli9765]

I hope that one day you'll go back and finish your lessons on Optics and Optical Technologies. You are a great teacher.

[@JordanEdmundsEECS]

Thank you :) If you have a specific list of topic ideas that would make good videos that would actually be most welcome. Shoot me an e-mail or hit me up on Patreon - I'm most responsive there.

[@PARELOL]

Thanks for video. Helpful to understand the basis of waveguide. Btw what is the drawing program?

[@saifamu1989]

Beautiful explanation

[@lowerpass2000]

Sir, this is AWESOME!

[@Kraja111]

wow where were you 2 jears ago when i had all these exams :( but very good job is just watched all your laser videos and they help very much

[@wolfgangkemptner8702]

question: can useing waveguide connections compensate for lack of AC-coupling and grounding of ports?

[@ec-053yedlakavya9]

Amazing explanation

[@KJ_KR]

0:36 You got rid of all my anxiety 😆

[@makgeollilover]

thanks, this probably saved lots of my time

[@vivekfaldu258]

Nice explanation. Could you further explain, how a waveguide mechanism works in a ferromagnetic resonance spectroscopy?

[@abdulhaliktahir7630]

very nice explaining.

[@Ganjalf_the_Green]

Studying this right now in Microwaves lectures. Cilindrical, rect, microstrip waveguides and so on. It's amazing but kinda scary at the same time to calculate those monstrous fields

[@bradmcclure4945]

what is the relationship of frequency and attenuation?

[@busyonthefarm]

Great explanation! Thanks.. btw is this the same guy that narrated the honey badger video?

[@donalfinn4205]

I liked the video but I hadn’t hardly a clue what you were talking about!☘️👍

[@Raitissems]

Alices yell caught me offguard. Good one

[@franciscob9488]

great video, thank you!!

[@JordanEdmundsEECS]

You are welcome! Anything in particular you liked?

[@J-Jq]

Thanks a lot

[@bernardmutisya407]

I liked the video even before watching it 💯

[@JordanEdmundsEECS]

xD

[@robinmathew5594]

what you mean by shape of the wave inside the waveguide ?

[@JordanEdmundsEECS]

The light intensity has a pattern to it - this is called the “mode profile”.

[@Decoy303]

Volca Drum brought me here. Not in the algorithm but because I wanted to understand just what a waveguide is.

[@Oussama-gr4xu]

hy, Thanks for your help.I would like to ask you one question about waveguide & electromagnetic radiations in Radar. ->> When we generate an RF signals >>then we amplifier , before the signal enter the waveguide: Here is the signal electromagnetic or analogue: If analogue where to turn to electromagnetic. If electromagnetic dose waveguide responsible for converting analogous to electromagnetic signal

[@JordanEdmundsEECS]

Everything is an electromagnetic wave. When the dimensions of the stuff involved is really small compared to the wavelength, we call it a "circuit" and we call the signal an "analog signal". When it is well-contained in a particular waveguide or circuit, we often call that an "RF circuit". When you send it to an antenna, because the antenna dimension is large, we call that an "electromagnetic wave" (and antennas are usually designed so that they radiate well).

[@Misha.a11]

can you explain how you got 4*10^-10 at 7:02? I’m trying to do the calculation and not getting the same result. Thank you

[@KISHORENEDUMARAN]

Hey, I hope you figured this out, but here's how I think he got 4*10^-10. Area of hemisphere, ignoring ground = 2πr^2 = 6300000 m^2 Area of his ear, considering as square = .05*.05 = .0025m^2 Attenuation = Area of bob's ear/ Area of hemisphere = .0025/6300000 = 3.96*10^-10 ≈ 4*10^-10

[@Misha.a11]

@@KISHORENEDUMARAN Thanks!! :D You rule!

[@gamerman866]

@@KISHORENEDUMARAN what did you take as r though

[@KISHORENEDUMARAN]

@@gamerman866 1km (1000m)

[@gamerman866]

@@KISHORENEDUMARAN 👍👍 nice

[@vasichar]

My name is not bob but your scream was so loud you brought me here.

[@ArturoJReal]

This is huge.

[@kega4062]

cool!!

[@bennemann]

Fantastic video, very instructional, thank you! The only part that confused me is how you said that where Alice shouts into the waveguide matters (top vs. bottom vs. center), but then shortly after you say that the ONLY thing that matters is the frequency of the wave. So it was contradictory there.

[@JordanEdmundsEECS]

Ah, my bad, let me clarify. Both things definitely matter. Where Alice shouts into the waveguide matters for how much of her voice gets inside, but once it’s inside all that matters is the frequency (loosely speaking).

[@peterkay7458]

@@JordanEdmundsEECS thank you that helped me as well lol

[@wecare838]

@@JordanEdmundsEECS really its a good video. I also wanted to know that what sort of application do you use to draw these animations? Those digital drawing boards look neat.

[@KISHORENEDUMARAN]

great video!

[@junwuluo1231]

1:24, should it be 1/r*r*r ?

[@nicholasrapose196]

I watched my professor's video of this subject an hour ago. I understood a very small percentage of that video. I watched this video just now. I understood 100% of it and am now ready to dive further into the math. What the fuck. Why does my professor even bother?

[@ericphan5857]

That is the problem it should be 1/ π^2 and π change as speed of light change over ether and space-time. So π is changing and R always =1 represents the source

[@fernandohood5542]

Is a parabolic shape reflector a waveguide ?

[@JordanEdmundsEECS]

Great question. A parabolic reflector usually takes light from far away, and sends it back far away (reflects it), so I wouldn't consider it a waveguide, because it isn't "confining" or "guiding" the light. It's more like a "waveshaper" than a waveguide.

[@milesprower6641]

You're next video on wave guides is private for some reason, and thus, I am unable to watch it.

[@chinmayanaik1434]

🙏 thankyou

[@sagarsaini1991]

where mother jewe;;ery

[@kingcosworth2643]

This is why you place the subwoofer of an audio system in the corner of your room, or rear plane of your vehicle.

[@snehamathivanan7679]

👌

[@amolpadale3308]

Engineering is amazing, when you learn,practice it the right way..

[@danishansari5995]

I wish you could come to Germany

[@Sarcastic_view]

So Bob is going to harmed due to discovery of wave guide

[@JordanEdmundsEECS]

No Bobs were harmed in the making of this video.

[@adityaverma2037]

Today i realised that optical fibres are basically a waveguides.

[@samuelkctweneboah-kodua5660]

hello sir can i give you my university outline so you teach all the subjects in microwave engineering for us.......

[@zubbyemodi1267]

Bob Lazar brought me here

[@eewls]

hey can I order some mirrors

[@JordanEdmundsEECS]

? 0.0 ?

[@abinaslimbu3057]

Chitte computer Core

[@thedestyroyerishere3336]

Audible sound is no different than any other radiation, it's all induction

[@StefanHoffmann84]

So a waveguide is basically a cable and a cable is a waveguide, right?

[@adityaverma2037]

Today i realised that optical fibres are basically a waveguides.