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

Prevodilac: Mile Živković Lektor: Milenka Okuka

I would like to demonstrate for the first time in public

Hteo bih da predstavim javno, po prvi put,

that it is possible to transmit a video

da je moguće poslati video snimak

from a standard off-the-shelf LED lamp

pomoću obične LED lampe,

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

ka solarnoj ćeliji, uz pomoć laptopa, koji ima ulogu prijemnika.

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

Vajfaj nije uključen, samo svetlo.

And you may wonder, what's the point?

Pitate se, u čemu je poenta?

And the point is this:

Poenta je u sledećem:

There will be a massive extension of the Internet

internet će se veoma raširiti

to close the digital divide,

da bi se premostio digitalni jaz

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

i da bi se omogućio takozvani "internet stvari"-

tens of billions of devices connected to the Internet.

desetine milijardi uređaja priključenih na internet.

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

Po mom mišljenju, tako rasprostranjen internet može da funkcioniše

if it's almost energy-neutral.

samo ako ne troši skoro nimalo energije.

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

Moramo koristiti postojeću infrastrukturu, koliko god je to moguće.

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

Tu stupaju na scenu solarna ćelija i LED.

I demonstrated for the first time,

Prvi put sam predstavio

at TED in 2011,

na TED-u 2011.

Li-Fi, or Light Fidelity.

tzv. laj-faj, zamenu za vaj-faj.

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

Laj-faj koristi LED za izuzetno brz prenos podataka

and also in a safe and secure manner.

na bezbedan način.

Data is transported by the light,

Podatak se prenosi pomoću svetlosti

encoded in subtle changes of the brightness.

šifriran u finim promenama osvetljenja.

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

Ako pogledamo okolo, ima mnogo LED-a oko nas,

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

znači postoji bogata infrastruktura laj-faj transmitera.

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

Ali do sada smo koristili posebne uređaje, male foto detektore,

to receive the information encoded in the data.

kako bismo dobili informacije kodirane u podacima.

I wanted to find a way to also use existing infrastructure

Želeo sam da pronađem i način da koristim postojeću infrastrukturu

to receive data from our Li-Fi lights.

da dobijem podatke iz naših Li-Fi svetala.

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

Zbog ovoga sam istraživao solarne ćelije i površine.

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

Solarna ćelija upija svetlost i pretvara je u električnu energiju.

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

Zato možemo koristiti solarne ćelije za punjenje svojih telefona.

But now we need to remember

Ali sada moramo da se setimo

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

da su podaci kodirani u suptilnim promenama jačine LED svetla,

so if the incoming light fluctuates,

tako da ako svetlo koje dolazi varira,

so does the energy harvested from the solar cell.

varira i energija koja se dobija iz solarne ćelije.

This means we have a principal mechanism in place

Ovo znači da imamo osnovni mehanizam

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

za dobijanje informacija iz svetlosti od solarne ćelije

because the fluctuations of the energy harvested

jer varijacije dobijene 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,

da li možemo dobiti brze i veoma suptilne promene u jačini svetlosti

such as the ones transmitted by our LED lights?

poput onih koje prenose naša LED svetla?

And the answer to that is yes, we can.

Odgovor na to je: da, možemo.

We have shown in the lab

U laboratoriji smo pokazali

that we can receive up to 50 megabytes per second

da možemo da dobijemo do 50 megabita u sekundi

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

iz standardne ćelije koja može da se kupi u prodavnici.

And this is faster than most broadband connections these days.

A ovo je brže od većine mreža visokog kapaciteta danas.

Now let me show you in practice.

Da vam pokažem to na delu.

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

U ovoj kutiji je standardna LED lampa koju možete kupiti bilo gde.

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

Ovo je standardna solarna ćelija,

it is connected to the laptop.

povezana je sa laptopom.

And also we have an instrument here

Takođe imamo instrument

to visualize the energy we harvest from the solar cell.

kojim prikazujemo energiju koja se dobija iz 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.

To je zato što solarna ćelija već dobija svetlo iz okruženja.

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

Prvo želim da uključim svetlo

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

i jednostavno ću ga uključiti

for a moment,

na trenutak,

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

i primetićete da će instrument poskočiti nadesno.

So the solar cell, for a moment,

Na trenutak, solarna ćelija

is harvesting energy from this artificial light source.

ubira svetlost iz ovog veštačkog izvora svetlosti.

If I turn it off, we see it drops.

Ukoliko ga isključim, vidimo da se smanjuje.

I turn it on ...

Uključim ga...

So we harvest energy with the solar cell.

Tako da dobijamo energiju iz solarne ćelije.

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

Ali sada bih voleo da aktiviram prenos video snimka.

And I've done this by pressing this button.

Ovo ću da uradim pritiskom dugmeta.

So now this LED lamp here is streaming a video

Sada ova LED lampa prenosi video snimak

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

tako što menja jačinu LED svetla na veoma suptilan način

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

i na takav način da se ne vidi golim okom

because the changes are too fast to recognize.

jer su promene prebrze da bi se primetile.

But in order to prove the point,

Ali kako bismo dokazali poentu,

I can block the light of the solar cell.

mogu da blokiram svetlo solarne ćelije.

So first you notice the energy harvesting drops

Prvo primetite da opada kupljenje energije

and the video stops as well.

kao i da staje video snimak.

If I remove the blockage, the video will restart.

Ukoliko uklonim blokadu, snimak će ponovo krenuti.

(Applause)

(Aplauz)

And I can repeat that.

I mogu da ponovim to.

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

Prekinemo prenos snimka i prestaje kupljenje energije.

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

Time se pokazuje da solarna ćelija služi kao prijemnik.

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

Ali sada zamislite da je ova LED lampa ulična svetiljka i da ima magle.

And so I want to simulate fog,

Želim da simuliram maglu,

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

zato sam sa sobom poneo maramicu.

(Laughter)

(Smeh)

And let me put the handkerchief over the solar cell.

Staviću je na solarnu ćeliju.

First you notice

Prvo primećujete

the energy harvested drops, as expected,

da opada prikupljanje energije, kao što je i očekivano,

but now the video still continues.

ali video snimak se nastavlja.

This means, despite the blockage,

To znači da, uprkos blokadi,

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

prolazi dovoljno svetla kroz maramicu do solarne ćelije,

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

tako da solarna ćelija može da dekodira i prenosi te informacije,

in this case, a high-definition video.

u ovom slučaju video snimak visoke rezolucije.

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

Ovde je zaista bitno to da je solarna ćelija postala prijemnik

for high-speed wireless signals encoded in light,

za bežične signale velike brzine koji su kodirani u svetlosti,

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

dok održava svoju primarnu funkciju kao sprava za ubiranje 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 kolibe

to act as a broadband receiver

kao prijemnike visokog kapaciteta

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

za laser na obližnjem brdu ili uličnu lampu.

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

Zaista nije bitno gde zrak pogodi solarnu ćeliju.

And the same is true

Ovo je isto

for translucent solar cells integrated into windows,

i za prozirne solarne ćelije koje se nalaze u prozorima,

solar cells integrated into street furniture,

solarne ćelije u nameštaju na ulici

or indeed, solar cells integrated into these billions of devices

ili solarne ćelije ugrađene u milijardama uređaja

that will form the Internet of Things.

koji će oformiti Internet stvari.

Because simply,

Jer prosto

we don't want to charge these devices regularly,

ne želimo da redovno punimo ove uređaje,

or worse, replace the batteries every few months.

ili još gore, da menjamo baterije svakih nekoliko meseci.

As I said to you,

Kao što sam rekao,

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

ovo je prvi put da ovo prikazujem u javnosti.

It's very much a lab demonstration,

Ovo je laboratorijski prikaz,

a prototype.

prototip.

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

Ali moj tim i ja smo uvereni da možemo ovo da predstavimo na tržištu

within the next two to three years.

u naredne dve do tri godine.

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

Nadamo se da ćemo moći da doprinesemo zatvaranju digitalnog jaza

and also contribute

kao i da doprinesemo

to connecting all these billions of devices to the Internet.

povezivanju milijardi ovih uređaja na internet.

And all of this without causing

I sve ovo bez izazivanja

a massive explosion of energy consumption --

ogromne eksplozije korišćenja energije -

because of the solar cells, quite the opposite.

zbog solarnih ćelija, desiće se sasvim suprotno.

Thank you.

Hvala vam.

(Applause)

(Aplauz)