TEDGlobal>London
Harald Haas: Forget Wi-Fi. Meet the new Li-Fi Internet
Harald Has (Harald Haas): Zaboravite Wi-Fi. Upoznajte novi Li-Fi internet
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Šta ako bismo mogli da koristimo postojeće tehnologije da pružimo pristup internetu za više od 4 milijarde ljudi, koji žive u mestima gde to infrastruktura ne dozvoljava? Koristeći LED sijalice i solarne ćelije koje se mogu kupiti bilo gde, Harald Has i njegov tim pokrenuli su novu tehnologiju koja prenosi podatke koristeći svetlo i baš to može biti ključ za premošćavanje digitalnog jaza. Pogledajte kako može izgledati budućnost interneta.
Harald Haas - Communications technology innovator
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate. Full bio
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate. Full bio
Double-click the English transcript below to play the video.
00:12
I would like to demonstrate
for the first time in public
for the first time in public
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Hteo bih da predstavim javno, po prvi put,
00:16
that it is possible to transmit a video
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da je moguće poslati video snimak
00:20
from a standard off-the-shelf LED lamp
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pomoću obične LED lampe,
00:24
to a solar cell with a laptop
acting as a receiver.
acting as a receiver.
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ka solarnoj ćeliji, uz pomoć laptopa,
koji ima ulogu prijemnika.
koji ima ulogu prijemnika.
00:30
There is no Wi-Fi involved,
it's just light.
it's just light.
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Vajfaj nije uključen, samo svetlo.
00:33
And you may wonder, what's the point?
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Pitate se, u čemu je poenta?
00:35
And the point is this:
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Poenta je u sledećem:
00:38
There will be a massive
extension of the Internet
extension of the Internet
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internet će se veoma raširiti
00:41
to close the digital divide,
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da bi se premostio digitalni jaz
00:43
and also to allow for what we call
"The Internet of Things" --
"The Internet of Things" --
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i da bi se omogućio takozvani
"internet stvari"-
"internet stvari"-
00:48
tens of billions of devices
connected to the Internet.
connected to the Internet.
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desetine milijardi uređaja
priključenih na internet.
priključenih na internet.
00:51
In my view, such an extension
of the Internet can only work
of the Internet can only work
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Po mom mišljenju, tako rasprostranjen
internet može da funkcioniše
internet može da funkcioniše
00:55
if it's almost energy-neutral.
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samo ako ne troši skoro nimalo energije.
00:58
This means we need to use existing
infrastructure as much as possible.
infrastructure as much as possible.
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Moramo koristiti postojeću infrastrukturu,
koliko god je to moguće.
koliko god je to moguće.
01:03
And this is where the solar cell
and the LED come in.
and the LED come in.
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Tu stupaju na scenu solarna ćelija i LED.
01:08
I demonstrated for the first time,
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Prvi put sam predstavio
01:11
at TED in 2011,
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na TED-u 2011.
01:13
Li-Fi, or Light Fidelity.
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tzv. laj-faj, zamenu za vaj-faj.
01:15
Li-Fi uses off-the-shelf LEDs
to transmit data incredibly fast,
to transmit data incredibly fast,
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Laj-faj koristi LED za
izuzetno brz prenos podataka
izuzetno brz prenos podataka
01:21
and also in a safe and secure manner.
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na bezbedan način.
01:25
Data is transported by the light,
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Podatak se prenosi pomoću svetlosti
01:28
encoded in subtle changes
of the brightness.
of the brightness.
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šifriran u finim promenama osvetljenja.
01:32
If we look around,
we have many LEDs around us,
we have many LEDs around us,
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Ako pogledamo okolo,
ima mnogo LED-a oko nas,
ima mnogo LED-a oko nas,
01:35
so there's a rich infrastructure
of Li-Fi transmitters around us.
of Li-Fi transmitters around us.
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znači postoji bogata infrastruktura
laj-faj transmitera.
laj-faj transmitera.
01:41
But so far, we have been using
special devices -- small photo detectors,
special devices -- small photo detectors,
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Ali do sada smo koristili posebne uređaje,
male foto detektore,
male foto detektore,
01:46
to receive the information
encoded in the data.
encoded in the data.
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kako bismo dobili informacije
kodirane u podacima.
kodirane u podacima.
01:50
I wanted to find a way to also use
existing infrastructure
existing infrastructure
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Želeo sam da pronađem i način
da koristim postojeću infrastrukturu
da koristim postojeću infrastrukturu
01:54
to receive data from our Li-Fi lights.
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da dobijem podatke iz naših Li-Fi svetala.
01:58
And this is why I have been looking into
solar cells and solar panels.
solar cells and solar panels.
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Zbog ovoga sam istraživao
solarne ćelije i površine.
solarne ćelije i površine.
02:03
A solar cell absorbs light
and converts it into electrical energy.
and converts it into electrical energy.
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Solarna ćelija upija svetlost
i pretvara je u električnu energiju.
i pretvara je u električnu energiju.
02:08
This is why we can use a solar cell
to charge our mobile phone.
to charge our mobile phone.
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Zato možemo koristiti solarne ćelije
za punjenje svojih telefona.
za punjenje svojih telefona.
02:13
But now we need to remember
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Ali sada moramo da se setimo
02:14
that the data is encoded in subtle changes
of the brightness of the LED,
of the brightness of the LED,
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da su podaci kodirani
u suptilnim promenama jačine LED svetla,
u suptilnim promenama jačine LED svetla,
02:21
so if the incoming light fluctuates,
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tako da ako svetlo koje dolazi varira,
02:24
so does the energy harvested
from the solar cell.
from the solar cell.
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varira i energija koja se dobija
iz solarne ćelije.
iz solarne ćelije.
02:28
This means we have
a principal mechanism in place
a principal mechanism in place
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Ovo znači da imamo osnovni mehanizam
02:32
to receive information from the light
and by the solar cell,
and by the solar cell,
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za dobijanje informacija iz svetlosti
od solarne ćelije
od solarne ćelije
02:38
because the fluctuations
of the energy harvested
of the energy harvested
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jer varijacije dobijene energije
02:41
correspond to the data transmitted.
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odgovaraju prenesenim podacima.
02:43
Of course the question is:
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Naravno, pitanje je:
02:46
can we receive very fast and subtle
changes of the brightness,
changes of the brightness,
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da li možemo dobiti brze i veoma suptilne
promene u jačini svetlosti
promene u jačini svetlosti
02:50
such as the ones transmitted
by our LED lights?
by our LED lights?
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poput onih koje prenose naša LED svetla?
02:54
And the answer to that is yes, we can.
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Odgovor na to je: da, možemo.
02:58
We have shown in the lab
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U laboratoriji smo pokazali
03:00
that we can receive up to 50
megabytes per second
megabytes per second
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da možemo da dobijemo
do 50 megabita u sekundi
do 50 megabita u sekundi
03:03
from a standard, off-the-shelf solar cell.
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iz standardne ćelije
koja može da se kupi u prodavnici.
koja može da se kupi u prodavnici.
03:06
And this is faster than most
broadband connections these days.
broadband connections these days.
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A ovo je brže od većine
mreža visokog kapaciteta danas.
mreža visokog kapaciteta danas.
03:11
Now let me show you in practice.
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Da vam pokažem to na delu.
03:17
In this box is a standard,
off-the-shelf LED lamp.
off-the-shelf LED lamp.
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U ovoj kutiji je standardna LED lampa
koju možete kupiti bilo gde.
koju možete kupiti bilo gde.
03:23
This is a standard,
off-the-shelf solar cell;
off-the-shelf solar cell;
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Ovo je standardna solarna ćelija,
03:25
it is connected to the laptop.
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povezana je sa laptopom.
03:28
And also we have an instrument here
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Takođe imamo instrument
03:31
to visualize the energy
we harvest from the solar cell.
we harvest from the solar cell.
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kojim prikazujemo energiju
koja se dobija iz solarne ćelije.
koja se dobija iz solarne ćelije.
03:35
And this instrument shows
something at the moment.
something at the moment.
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Ovaj instrument trenutno pokazuje nešto.
03:37
This is because the solar cell already
harvests light from the ambient light.
harvests light from the ambient light.
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To je zato što solarna ćelija
već dobija svetlo iz okruženja.
već dobija svetlo iz okruženja.
03:43
Now what I would like to do first
is switch on the light,
is switch on the light,
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Prvo želim da uključim svetlo
03:45
and I'll simply, only switch on the light,
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i jednostavno ću ga uključiti
03:48
for a moment,
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na trenutak,
03:50
and what you'll notice is that
the instrument jumps to the right.
the instrument jumps to the right.
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i primetićete da će instrument
poskočiti nadesno.
poskočiti nadesno.
03:54
So the solar cell, for a moment,
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Na trenutak, solarna ćelija
03:56
is harvesting energy
from this artificial light source.
from this artificial light source.
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ubira svetlost
iz ovog veštačkog izvora svetlosti.
iz ovog veštačkog izvora svetlosti.
04:00
If I turn it off, we see it drops.
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Ukoliko ga isključim,
vidimo da se smanjuje.
vidimo da se smanjuje.
04:03
I turn it on ...
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Uključim ga...
04:05
So we harvest energy with the solar cell.
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Tako da dobijamo energiju
iz solarne ćelije.
iz solarne ćelije.
04:08
But next I would like to activate
the streaming of the video.
the streaming of the video.
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Ali sada bih voleo da aktiviram
prenos video snimka.
prenos video snimka.
04:15
And I've done this
by pressing this button.
by pressing this button.
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Ovo ću da uradim pritiskom dugmeta.
04:17
So now this LED lamp here
is streaming a video
is streaming a video
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Sada ova LED lampa
prenosi video snimak
prenosi video snimak
04:22
by changing the brightness of the LED
in a very subtle way,
in a very subtle way,
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tako što menja jačinu LED svetla
na veoma suptilan način
na veoma suptilan način
04:26
and in a way that you can't
recognize with your eye,
recognize with your eye,
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i na takav način da se ne vidi golim okom
04:29
because the changes
are too fast to recognize.
are too fast to recognize.
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jer su promene prebrze da bi se primetile.
04:33
But in order to prove the point,
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Ali kako bismo dokazali poentu,
04:35
I can block the light of the solar cell.
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mogu da blokiram svetlo solarne ćelije.
04:40
So first you notice
the energy harvesting drops
the energy harvesting drops
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Prvo primetite da opada kupljenje energije
04:43
and the video stops as well.
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kao i da staje video snimak.
04:45
If I remove the blockage,
the video will restart.
the video will restart.
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Ukoliko uklonim blokadu,
snimak će ponovo krenuti.
snimak će ponovo krenuti.
04:49
(Applause)
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(Aplauz)
04:55
And I can repeat that.
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I mogu da ponovim to.
04:57
So we stop the transmission of the video
and energy harvesting stops as well.
and energy harvesting stops as well.
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Prekinemo prenos snimka
i prestaje kupljenje energije.
i prestaje kupljenje energije.
05:03
So that is to show that the solar cell
acts as a receiver.
acts as a receiver.
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Time se pokazuje da solarna ćelija
služi kao prijemnik.
služi kao prijemnik.
05:08
But now imagine that this LED lamp
is a street light, and there's fog.
is a street light, and there's fog.
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Ali sada zamislite da je ova LED lampa
ulična svetiljka i da ima magle.
ulična svetiljka i da ima magle.
05:14
And so I want to simulate fog,
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Želim da simuliram maglu,
05:16
and that's why I brought
a handkerchief with me.
a handkerchief with me.
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zato sam sa sobom poneo maramicu.
05:19
(Laughter)
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(Smeh)
05:20
And let me put the handkerchief
over the solar cell.
over the solar cell.
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Staviću je na solarnu ćeliju.
05:25
First you notice
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Prvo primećujete
05:27
the energy harvested drops, as expected,
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da opada prikupljanje energije,
kao što je i očekivano,
kao što je i očekivano,
05:31
but now the video still continues.
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ali video snimak se nastavlja.
05:34
This means, despite the blockage,
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To znači da, uprkos blokadi,
05:37
there's sufficient light coming through
the handkerchief to the solar cell,
the handkerchief to the solar cell,
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prolazi dovoljno svetla kroz maramicu
do solarne ćelije,
do solarne ćelije,
05:41
so that the solar cell is able to decode
and stream that information,
and stream that information,
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tako da solarna ćelija može da dekodira
i prenosi te informacije,
i prenosi te informacije,
05:46
in this case, a high-definition video.
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u ovom slučaju video snimak
visoke rezolucije.
visoke rezolucije.
05:51
What's really important here is that
a solar cell has become a receiver
a solar cell has become a receiver
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Ovde je zaista bitno to
da je solarna ćelija postala prijemnik
da je solarna ćelija postala prijemnik
05:56
for high-speed wireless signals
encoded in light,
encoded in light,
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za bežične signale velike brzine
koji su kodirani u svetlosti,
koji su kodirani u svetlosti,
06:00
while it maintains its primary function
as an energy-harvesting device.
as an energy-harvesting device.
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dok održava svoju primarnu funkciju
kao sprava za ubiranje energije.
kao sprava za ubiranje energije.
06:05
That's why it is possible
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Zato je moguće
06:08
to use existing solar cells
on the roof of a hut
on the roof of a hut
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koristiti postojeće solarne ćelije
na krovu kolibe
na krovu kolibe
06:12
to act as a broadband receiver
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kao prijemnike visokog kapaciteta
06:14
from a laser station on a close by hill,
or indeed, lamp post.
or indeed, lamp post.
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za laser na obližnjem brdu
ili uličnu lampu.
ili uličnu lampu.
06:19
And It really doesn't matter
where the beam hits the solar cell.
where the beam hits the solar cell.
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Zaista nije bitno
gde zrak pogodi solarnu ćeliju.
gde zrak pogodi solarnu ćeliju.
06:23
And the same is true
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Ovo je isto
06:24
for translucent solar cells
integrated into windows,
integrated into windows,
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i za prozirne solarne ćelije
koje se nalaze u prozorima,
koje se nalaze u prozorima,
06:28
solar cells integrated
into street furniture,
into street furniture,
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solarne ćelije u nameštaju na ulici
06:32
or indeed, solar cells integrated
into these billions of devices
into these billions of devices
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ili solarne ćelije ugrađene
u milijardama uređaja
u milijardama uređaja
06:36
that will form the Internet of Things.
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koji će oformiti Internet stvari.
06:38
Because simply,
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Jer prosto
06:40
we don't want to charge
these devices regularly,
these devices regularly,
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ne želimo da redovno punimo
ove uređaje,
ove uređaje,
06:42
or worse, replace the batteries
every few months.
every few months.
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ili još gore, da menjamo baterije
svakih nekoliko meseci.
svakih nekoliko meseci.
06:46
As I said to you,
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Kao što sam rekao,
06:48
this is the first time
I've shown this in public.
I've shown this in public.
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ovo je prvi put
da ovo prikazujem u javnosti.
da ovo prikazujem u javnosti.
06:50
It's very much a lab demonstration,
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Ovo je laboratorijski prikaz,
06:52
a prototype.
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prototip.
06:54
But my team and I are confident
that we can take this to market
that we can take this to market
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Ali moj tim i ja smo uvereni
da možemo ovo da predstavimo na tržištu
da možemo ovo da predstavimo na tržištu
06:57
within the next two to three years.
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u naredne dve do tri godine.
07:00
And we hope we will be able to contribute
to closing the digital divide,
to closing the digital divide,
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Nadamo se da ćemo moći da doprinesemo
zatvaranju digitalnog jaza
zatvaranju digitalnog jaza
07:05
and also contribute
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kao i da doprinesemo
07:06
to connecting all these billions
of devices to the Internet.
of devices to the Internet.
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povezivanju milijardi ovih uređaja
na internet.
na internet.
07:10
And all of this without causing
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I sve ovo bez izazivanja
07:11
a massive explosion
of energy consumption --
of energy consumption --
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ogromne eksplozije korišćenja energije -
zbog solarnih ćelija,
desiće se sasvim suprotno.
desiće se sasvim suprotno.
07:14
because of the solar cells,
quite the opposite.
quite the opposite.
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07:16
Thank you.
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Hvala vam.
07:17
(Applause)
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(Aplauz)
ABOUT THE SPEAKER
Harald Haas - Communications technology innovatorHarald Haas is the pioneer behind a new technology that can communicate as well as illuminate.
Why you should listen
Imagine using your car headlights to transmit data ... or surfing the web safely on a plane, tethered only by a line of sight. Harald Haas is working on it. He currently holds the Chair of Mobile Communications at the University of Edinburgh, and is co-founder and Chief Scientific Officer of pureLiFi Ltd as well as the Director of the LiFi Research and Development Center at the University of Edinburgh. His main research interests are in optical wireless communications, hybrid optical wireless and RF communications, spatial modulation, and interference coordination in wireless networks.
Haas has long been studying ways to communicate electronic data signals, designing modulation techniques that pack more data onto existing networks. But his latest work leaps beyond wires and radio waves to transmit data via an LED bulb that glows and darkens faster than the human eye can see. His group published the first proof-of-concept results demonstrating that it is possible to to turn commercially available light emitting diode (LED) light bulbs into broadband wireless transmission systems.
"It should be so cheap that it's everywhere," he says. "Using the visible light spectrum, which comes for free, you can piggy-back existing wireless services on the back of lighting equipment."
Harald Haas | Speaker | TED.com