Forget Wi-Fi. Meet the new Li-Fi Internet | Harald Haas

Prevoditelj: Sonja Žarić Recezent: Ivan Stamenković

I would like to demonstrate for the first time in public

Želio bih prvi puta u javnosti demonstrirati

that it is possible to transmit a video

da je moguće poslati video

from a standard off-the-shelf LED lamp

sa standardne LED svjetiljke

to a solar cell with a laptop acting as a receiver.

na solarnu ćeliju sa laptopom kao prijamnikom.

There is no Wi-Fi involved, it's just light.

Wi-Fi nije uključen, samo svjetlo.

And you may wonder, what's the point?

Možda se pitate, koja je poanta?

And the point is this:

Poanta je ovo:

There will be a massive extension of the Internet

Postojat će ogromni produžetak Interneta

to close the digital divide,

da premosti digitalnu podjelu,

and also to allow for what we call "The Internet of Things" --

i da dopusti ono što nazivamo "Internet Stvari" --

tens of billions of devices connected to the Internet.

deseci milijardi uređaja spojeni na Internet.

In my view, such an extension of the Internet can only work

Po mom mišljenju, takav produžetak Interneta može raditi jedino

if it's almost energy-neutral.

ako je skoro energetski neutralan.

This means we need to use existing infrastructure as much as possible.

To znači da moramo koristiti postojeću infrastrukturu što je više moguće.

And this is where the solar cell and the LED come in.

Tu u priču ulaze solarne ćelije i LED svjetla.

I demonstrated for the first time,

Demonstrirao sam prvi puta

at TED in 2011,

na TED-u 2011. godine,

Li-Fi, or Light Fidelity.

Li-Fi, ili Light Fidelity.

Li-Fi uses off-the-shelf LEDs to transmit data incredibly fast,

Li-Fi koristi kupovne LED diode za veoma brz prijenos podataka,

and also in a safe and secure manner.

na siguran način.

Data is transported by the light,

Podatak se prenosi putem svjetla,

encoded in subtle changes of the brightness.

enkodiran u suptilnim promjenama svjetline.

If we look around, we have many LEDs around us,

Ako pogledate oko sebe, vidjet ćete mnoštvo LED svjetiljki u okolini,

so there's a rich infrastructure of Li-Fi transmitters around us.

prema tome postoji bogata infrastruktura LI-Fi odašiljača oko nas.

But so far, we have been using special devices -- small photo detectors,

No, dosad, smo koristili posebne uređaje -- male fotodetektore,

to receive the information encoded in the data.

za primanje informacija enkodiranih u podatke.

I wanted to find a way to also use existing infrastructure

Želio sam pronaći način da se iskoristiti postojeća infrastruktura

to receive data from our Li-Fi lights.

za primanje podataka putem Li-Fi svjetla.

And this is why I have been looking into solar cells and solar panels.

I zato sam se počeo baviti solarnim ćelijama i solarnim panelima.

A solar cell absorbs light and converts it into electrical energy.

Solarna ćelija upija i pretvara svjetlost u električnu energiju.

This is why we can use a solar cell to charge our mobile phone.

Zato možemo koristiti solarne ćelije za punjenje mobitela.

But now we need to remember

Prisjetimo se da

that the data is encoded in subtle changes of the brightness of the LED,

su podaci enkodirani u suptilnim promjenama svjetline LED diode,

so if the incoming light fluctuates,

te ako je dolazno svjetlo promjenjivo,

so does the energy harvested from the solar cell.

onda je promjenjiva i energija prikupljena u solarnoj ćeliji.

This means we have a principal mechanism in place

To znači da imamo prinicipijelni mehanizam

to receive information from the light and by the solar cell,

za primanje informacije iz svjetla pomoću solarne ćelije,

because the fluctuations of the energy harvested

jer fluktuacije prikupljene energije

correspond to the data transmitted.

odgovaraju prenesenim podacima.

Of course the question is:

Naravno, pitanje je:

can we receive very fast and subtle changes of the brightness,

možemo li primati veoma brze i suptilne promjene svjetline,

such as the ones transmitted by our LED lights?

poput one koje naše LED svjetlo odašilje?

And the answer to that is yes, we can.

A odgovor na to pitanje je, da, možemo.

We have shown in the lab

Ispitivanje u laboratoriju

that we can receive up to 50 megabytes per second

je pokazalo da je moguće primati do 50 MB po sekundi

from a standard, off-the-shelf solar cell.

pomoću standardne, kupovne solarne ćelije.

And this is faster than most broadband connections these days.

Ovo je mnogo veća brzina od većine širokopojasnih veza.

Now let me show you in practice.

Dopustite da vam demonstriram.

In this box is a standard, off-the-shelf LED lamp.

U ovoj kutiji se nalazi standardna, kupovna LED svjetiljka.

This is a standard, off-the-shelf solar cell;

Ovo je standardna, kupovna solarna ćelija;

it is connected to the laptop.

spojena je na laptop.

And also we have an instrument here

Također, ovdje imamo instrument

to visualize the energy we harvest from the solar cell.

koji vizualizira energiju prikupljenu pomoću solarne ćelije.

And this instrument shows something at the moment.

Ovaj instrument trenutno pokazuje nešto.

This is because the solar cell already harvests light from the ambient light.

Zato što solarna ćelija već prikuplja svjetlo iz okoline.

Now what I would like to do first is switch on the light,

Prvo bih htio uključiti svjetlo,

and I'll simply, only switch on the light,

tako da ću prvo samo uključiti svjetlo,

for a moment,

na trenutak,

and what you'll notice is that the instrument jumps to the right.

i primjetit ćete da instrument skače udesno.

So the solar cell, for a moment,

Solarna ćelija, trenutno,

is harvesting energy from this artificial light source.

prikuplja energiju iz ovog umjetnog izvora svjetlosti.

If I turn it off, we see it drops.

Ako ga isključim, vidimo da opada.

I turn it on ...

Uključim ga...

So we harvest energy with the solar cell.

Prema tome, prikupljamo energiju pomoću solarne ćelije.

But next I would like to activate the streaming of the video.

Sljedeće bih želio pokrenuti prijenos videa.

And I've done this by pressing this button.

To ću napraviti pritiskanjem ove tipke.

So now this LED lamp here is streaming a video

Ova LED svjetiljka sada prenosi video

by changing the brightness of the LED in a very subtle way,

promjenom svjetline LED diode na veoma suptilan način,

and in a way that you can't recognize with your eye,

na način na koji ne možete primjetiti golim okom,

because the changes are too fast to recognize.

jer su promjene prebrze da bi ih primjetili.

But in order to prove the point,

Da bih vam dokazao,

I can block the light of the solar cell.

mogu blokirati svjetlo solarne ćelije.

So first you notice the energy harvesting drops

Prvo primjećujete pad prikupljene energije

and the video stops as well.

i video staje, također.

If I remove the blockage, the video will restart.

Kad uklonim prepreku, video počinje ponovno.

(Applause)

(Pljesak)

And I can repeat that.

I može se ponoviti.

So we stop the transmission of the video and energy harvesting stops as well.

Prekinemo prijenos videa i prikupljanje energije prestaje, također.

So that is to show that the solar cell acts as a receiver.

To pokazuje da se solarna ćelija ponaša kao prijamnik.

But now imagine that this LED lamp is a street light, and there's fog.

Zamislite da je LED svjetiljka ulično svjetlo, i magla je.

And so I want to simulate fog,

Želim simulirati maglu,

and that's why I brought a handkerchief with me.

zato sam ponio maramicu sa sobom.

(Laughter)

(Smijeh)

And let me put the handkerchief over the solar cell.

Stavimo maramicu preko solarne ćelije.

First you notice

Prvo primjetite

the energy harvested drops, as expected,

da prikupljanje energije opada, kao što je i očekivano,

but now the video still continues.

ali video ipak nastavlja.

This means, despite the blockage,

Ovo znači, usprkos blokadi,

there's sufficient light coming through the handkerchief to the solar cell,

dovoljna količina svjetlosti dopire kroz maramicu do solarne ćelije,

so that the solar cell is able to decode and stream that information,

da bi solarna ćelija dekodirala i prenijela tu informaciju,

in this case, a high-definition video.

u ovom slučaju, video visoke razlučivosti.

What's really important here is that a solar cell has become a receiver

Ono što je zaista bitno ovdje je da solarna ćelija postaje prijamnik

for high-speed wireless signals encoded in light,

za bežične signale visoke brzine enkodirane u svjetlu,

while it maintains its primary function as an energy-harvesting device.

dok zadržava svoju prvotnu funkciju uređaja za prikupljanje energije.

That's why it is possible

Zato je moguće

to use existing solar cells on the roof of a hut

koristiti postojeće solarne ćelije na krovu nastambe

to act as a broadband receiver

kao širokopojasne prijemnike

from a laser station on a close by hill, or indeed, lamp post.

od laserske stanice na obližnjem brdu, ili stub za uličnu rasvjetu.

And It really doesn't matter where the beam hits the solar cell.

Zaista nije bitno gdje zraka pogodi solarnu ćeliju.

And the same is true

Isto vrijedi i za

for translucent solar cells integrated into windows,

prozirne solarne ćelije integrirane u prozorima,

solar cells integrated into street furniture,

solarne ćelije integrirane u ulične elemente,

or indeed, solar cells integrated into these billions of devices

ili solarne ćelije intregrirane u ove milijarde uređaja

that will form the Internet of Things.

koji će tvoriti Internet Stvari.

Because simply,

Jer, jednostavno,

we don't want to charge these devices regularly,

ne želimo puniti ove uređaje redovno,

or worse, replace the batteries every few months.

ili još gore, mijenjati baterije svakih par mjeseci.

As I said to you,

Kao što sam rekao,

this is the first time I've shown this in public.

ovo je prvi puta da je ovo prikazano u javnosti.

It's very much a lab demonstration,

Ovo je laboratorijska demonstracija,

a prototype.

prototip.

But my team and I are confident that we can take this to market

No, moj tim i ja smo uvjereni da možemo izaći na tržište sa ovim

within the next two to three years.

u sljedeće dvije do tri godine.

And we hope we will be able to contribute to closing the digital divide,

Nadamo se ćemo moći doprinijeti premoštavanju digitalne podjele,

and also contribute

i također, doprinijeti

to connecting all these billions of devices to the Internet.

spajanju svih ovih milijardi uređaja na Internet.

And all of this without causing

I sve to bez uzrokovanja

a massive explosion of energy consumption --

masivne eksplozije potrošnje energije --

because of the solar cells, quite the opposite.

zbog solarnih ćelija, upravo suprotno.

Thank you.

Hvala vam.

(Applause)

(Pljesak)