Friday, October 15, 2021

Li-Fi The New Wi-Fi: 100 Times The Speed of Wi-Fi!

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So, Li-Fi. The word is catchy as shit, and this seems to look like the better sibling of Wi-Fi. The internet exploded a few days ago when Velmenni, an Estonian company, tested the technology and reached 224 Gbps in their labs and 1Gbps outside. This, when we are struggling to reach even 27 Mbps 😛

Li-Fi The New Wi-Fi: 100 Times The Speed of Wi-Fi! 1
Okla speed test for my college network

So, yeah. 1 Gbps sounds like a dream. While everyone was going WOWW!!, Stupid me, I was asking, what the hell is that? (Shameful of me, despite being a computer science student )

Light-Fidelity (Li-Fi)

Yes. It uses light! The regular Wi-fi transmits over radio waves, using the 2.4 gigahertz (12 cm) UHF and 5 gigahertz (6 cm) SHF ISM radio bands, to be precise. At the same time, the Li-fi uses visible light.

Li-Fi The New Wi-Fi: 100 Times The Speed of Wi-Fi! 2

Basically, Li-Fi refers to visible light communications (VLC) technology, which delivers high-speed, bidirectional, networked mobile communications like Wi-Fi.

Li-fi was first coined by German physicist Harald Haas during a TED Talk when he outlined using light bulbs as wireless routers. Initially, it was written off as one of those brilliant technologies which will never come to fruition. But soon after the TED talk, professor Haas created a group called pureLiFi, and they have already produced two products since.

Visible Light Communications

VLC uses LED bulbs, and these bulbs constantly emit photons when a constant current is applied. If you vary the current, the light dims and brightens, kind of like disco lights. So, what happens if you do this modulation at extremely high frequency?

The disco lights become constant lights, like your living room lights, but to your eyes only. A photodetector device can still detect the variances in intensity (You can’t party, but the device can, it sounds like a weird world, doesn’t it?) can easily convert these fluctuations back to electricity. So this gives a seamless transfer of data through your living room lights (Fantasyland!).

Li-Fi The New Wi-Fi: 100 Times The Speed of Wi-Fi! 3
the image was taken from pureLiFi.co.uk

All this seems like really good news! All of us have lights at home, the transmission is like 1000 times faster, LED lights are cheap. Visible light communications seem like a great solution!

And it can be used at places that use radiofrequency for other stuff, like Hospitals and airplanes, to reduce the interference in the radio band.

But.

After every “if” that is solved, there is always a “but” to be resolved.

Firstly, it might take the technology about half a decade to come to market. We already have customized things to accommodate Wi-Fi; introducing Li-Fi would mean shifting everything and wasting the infrastructure created for Wi-Fi.

And did you realize? Light can’t pass through walls, so no bandwidth stealing from the neighbors’ open Wi-Fi. It would also create problems for offices, which tend to have walls separating different sections.

Oh, and sunlight will pretty much screw Li-Fi, so you can’t use it outdoors.

What you might see in the future is a combined Wi-Fi, Li-Fi thing, where Li-Fi will be used for high bandwidth and Wi-Fi for normal human tasks.

All said and done, Li-fi is definitely here to stay. Just like any other revolutionary idea, it just needs some time to set its footing in the world, and probably by the time we are oldies, our kids would be looking at Wi-Fi routers the way we look at the CRT based monitors which had entered people’s lives in the ’70s and ’80s.

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