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TEDGlobal 2011

Harald Haas: Wireless data from every light bulb

哈洛哈斯: 讓每顆燈泡都為我們傳輸無線資料

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如果世上每一顆燈泡都可以用來傳輸數據,那該會怎樣呢? 在 TEDGlobal 大會中,哈洛哈斯 (Harald Haas) 首度公開展示能夠實現這一理想的設備: 藉著從一個單一 LED 所發出的一閃一閃光線 (這種閃爍過於快速,肉眼看不見),它可以傳送比基地台還要多的數據。它的方式更高效、更安全、也更普遍。

- Communications technology innovator
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate. Full bio

Do you know
你知道
00:15
that we have 1.4 million百萬 cellular細胞的 radio無線電 masts桅杆
全世界手機通訊天線桿的數量
00:17
deployed部署 worldwide全世界?
已達140萬
00:20
And these are base基礎 stations.
這是基地台
00:22
And we also have
此外
00:24
more than five billion十億
還有50億以上
00:26
of these devices設備 here.
手持裝置
00:28
These are cellular細胞的 mobile移動 phones手機.
也就是蜂窩手機
00:30
And with these mobile移動 phones手機,
手機的資料傳輸量
00:33
we transmit發送 more than 600 terabytes兆兆字節 of data數據
每個月計算總共有
00:35
every一切 month.
600兆bits
00:37
This is a 6 with 14 zeroes --
6後面加上14個0
00:39
a very large number.
極大的數字
00:41
And wireless無線 communications通訊
無線通訊
00:43
has become成為 a utility效用
已成為和水、電一樣
00:46
like electricity電力 and water.
的民生用品
00:49
We use it everyday每天. We use it in our everyday每天 lives生活 now --
日常生活不可或缺
00:51
in our private私人的 lives生活, in our business商業 lives生活.
私人領域,商業領域
00:54
And we even have to be asked sometimes有時, very kindly和藹,
有時甚至必須非常客氣
00:56
to switch開關 off the mobile移動 phone電話 at events事件 like this
才能請來賓暫將手機關機
01:00
for good reasons原因.
譬如今天這裡的場合
01:02
And it's this importance重要性
它的重要性,促使我
01:05
why I decided決定 to look into the issues問題
決定探索這種技術
01:07
that this technology技術 has,
與之相關的幾個議題
01:09
because it's so fundamental基本的 to our lives生活.
因它對大家都至關重要
01:11
And one of the issues問題 is capacity容量.
首先是承载量
01:14
The way we transmit發送 wireless無線 data數據 is by using運用 electromagnetic電磁 waves波浪 --
我們用來傳輸無線訊號的是
01:16
in particular特定, radio無線電 waves波浪.
電磁頻譜中的無線電波
01:19
And radio無線電 waves波浪 are limited有限.
無線電波的承载量有限
01:22
They are scarce稀缺; they are expensive昂貴;
頻寬稀有,費用也貴
01:24
and we only have a certain某些 range範圍 of it.
能用的只有幾個波段
01:26
And it's this limitation局限性
這個資源和每個月
01:30
that doesn't cope應付
手機傳輸資料量的需求
01:32
with the demand需求 of wireless無線 data數據 transmissions傳輸
根本難以
01:34
and the number of bytes字節 and data數據 which哪一個 are transmitted發送 every一切 month.
相提並論
01:36
And we are simply只是 running賽跑 out of spectrum光譜.
頻譜資源誠然已達枯竭
01:39
There's another另一個 problem問題.
第二個麻煩是:
01:41
That is efficiency效率.
效能
01:43
These 1.4 million百萬 cellular細胞的 radio無線電 masts桅杆, or base基礎 stations,
這140萬個手機基地台
01:45
consume消耗 a lot of energy能源.
全都高秏電
01:48
And mind心神 you, most of the energy能源
更重要的是, 大部分所耗的電還不是用來
01:50
is not used to transmit發送 the radio無線電 waves波浪,
打出無線電波
01:52
it is used to cool the base基礎 stations.
而是用來冷卻基地台
01:54
Then the efficiency效率 of such這樣 a base基礎 station
每支基地台的效能
01:57
is only at about five percent百分.
大約只有5%而已
01:59
And that creates創建 a big problem問題.
問題不小
02:02
Then there's another另一個 issue問題 that you're all aware知道的 of.
第三個問題,大家都注意到了
02:05
You have to switch開關 off your mobile移動 phone電話
飛機上,醫院裡,會告知您「請關機」
02:08
during flights航班.
這些場所,無可避免
02:10
In hospitals醫院, they are security安全 issues問題.
因儀器操作安全性理由禁用無線電
02:12
And security安全 is another另一個 issue問題.
第4點,資料傳輸的安全性
02:15
These radio無線電 waves波浪 penetrate穿透 through通過 walls牆壁.
無線電波穿得透牆壁
02:18
They can be intercepted截獲,
有心人可以解碼
02:20
and somebody can make use of your network網絡
竊取你的資料,作非法用途
02:22
if he has bad intentions意圖.
竊取你的資料,作非法用途
02:25
So these are the main主要 four issues問題.
無線電波通訊總共有以上4個問題
02:27
But on the other hand,
但另一方面,我們卻有
02:29
we have 14 billion十億 of these:
140億顆燈泡
02:31
light bulbs燈泡, light.
燈泡代表:光資源
02:33
And light is part部分 of the electromagnetic電磁 spectrum光譜.
光也是電磁頻譜的一部份
02:36
So let's look at this in the context上下文
我們就來看一下
02:39
of the entire整個 electromagnetic電磁 spectrum光譜, where we have gamma伽馬 rays陽光.
整個電磁波頻譜中,最右邊
02:41
You don't want to get close to gamma伽馬 rays陽光, it could be dangerous危險.
伽瑪射線,這個絕對要遠離,極端危險
02:44
X-raysX射線, useful有用 when you go to hospitals醫院.
X射線,上醫院才用
02:46
Then there's ultraviolet紫外線 light.
再來是紫外線
02:49
it's good for a nice不錯 suntan曬黑,
曬出特定膚色很好用
02:51
but otherwise除此以外 dangerous危險 for the human人的 body身體.
否則對人體有害
02:53
Infrared紅外線 --
紅外線
02:55
due應有 to eye safety安全 regulations法規,
由於眼部保健的原因
02:57
can be only used with low power功率.
規定只能用低頻的部份
02:59
And then we have the radio無線電 waves波浪, they have the issues問題 I've just mentioned提到.
最左是無線電波,剛說過它的瓶頸
03:01
And in the middle中間 there, we have this visible可見 light spectrum光譜.
在電磁波譜差不多中央地帶有個可見光的部份
03:04
It's light,
也就是光
03:07
and light has been around for many許多 millions百萬 of years年份.
有地球的第一天就有光
03:09
And in fact事實, it has created創建 us,
事實上,光孕育了我們這些生命體
03:11
has created創建 life,
光創造了周遭萬千種種生命
03:14
has created創建 all the stuff東東 of life.
光創造了周遭萬千種種生命
03:16
So it's inherently本質 safe安全 to use.
當然是很安全可用的
03:18
And wouldn't不會 it be great to use that for wireless無線 communications通訊?
那為什麼我們不能用它來做無線電波傳輸呢?
03:21
Not only that, I compared相比 [it to] the entire整個 spectrum光譜.
不僅如此,當我拿它來和無線電波頻寬相比
03:25
I compared相比 the radio無線電 waves波浪 spectrum光譜 --
不僅如此,我還拿它來和無線電波頻寬相比
03:28
the size尺寸 of it --
比它們在光譜上的範圍大小
03:30
with the size尺寸 of the visible可見 light spectrum光譜.
在光譜上的範圍大小
03:32
And guess猜測 what?
結果是:
03:34
We have 10,000 times more of that spectrum光譜,
光波段的頻譜要比無線電波寬了1萬倍!
03:36
which哪一個 is there for us to use.
只等著我們去開發使用!
03:39
So not only do we have this huge巨大 amount of spectrum光譜,
所以不只是頻寬很大可以去用
03:42
let's compare比較 that with a number I've just mentioned提到.
還有幾個數字也值得看一下做個比較
03:45
We have 1.4 million百萬
140萬座手機基地台
03:47
expensively昂貴 deployed部署,
低能源效益
03:49
inefficient低效 radio無線電 cellular細胞的 base基礎 stations.
昂貴且低效益
03:51
And multiply that by 10,000,
140萬 x 10,000
03:54
then you end結束 up at 14 billion十億.
=140億
03:56
14 billion十億 is the number of light bulbs燈泡 installed安裝 already已經.
140億正好是現有的燈具數量
03:58
So we have the infrastructure基礎設施 there.
也就是說,基礎設施已經佈建完成!
04:01
Look at the ceiling天花板, you see all these light bulbs燈泡.
你們看吧,天花板,到處
04:03
Go to the main主要 floor地板, you see these light bulbs燈泡.
一樓大廳,都已經裝了很多燈泡
04:06
Can we use them for communications通訊?
我們可以用它來做無線通訊傳輸嗎?
04:08
Yes.
可以
04:10
What do we need to do?
怎麼做?
04:12
The one thing we need to do
首先要把這個
04:14
is we have to replace更換 these inefficient低效 incandescent白熾燈 light bulbs燈泡,
白熱光燈炮
04:16
florescent熒光 lights燈火,
並且不太節能的,日光燈炮
04:19
with this new technology技術 of LED,
改換成這個
04:22
LED light bulbs燈泡.
LED燈泡
04:24
An LED is a semiconductor半導體. It's an electronic電子 device設備.
LED是半導體產品,電子元件
04:26
And it has a very nice不錯 acute急性 property屬性.
有著一個很棒的極端特性
04:28
Its intensity強度 can be modulated調製
它的密度可編碼轉換為高速資料流
04:32
at very high speeds速度,
它的密度可編碼轉換為高速資料流
04:35
and it can be switched交換的 off at very high speeds速度.
熄燈亮燈都可以高速進行
04:37
And this is a fundamental基本的 basic基本 property屬性
我們的技術
04:40
that we exploit利用
就是利用這個特性開發出來的
04:42
with our technology技術.
接下來我們看看
04:44
So let's show顯示 how we do that.
這種技術要怎麼做
04:47
Let's go to the closest最近的 neighbor鄰居 to the visible可見 light spectrum光譜 --
先看在光譜上最近的隔壁鄰居
04:49
go to remote遠程 controls控制.
遙控器
04:51
You all know remote遠程 controls控制 have an infrared紅外線 LED --
大家都知道遙控器裡有個小LED燈泡,紅外線的
04:53
basically基本上 you switch開關 on the LED, and if it's off, you switch開關 it off.
按一下遙控器它就開,再按一下就關
04:55
And it creates創建 a simple簡單, low-speed低速 data數據 stream
它發出單一低速的資料流
04:58
in 10,000 bits per second第二,
每秒10k bits
05:01
20,000 bits per second第二.
20k bits左右
05:03
Not usable可用 for a YouTubeYouTube的 video視頻.
用來傳youtube 影片是不可能的
05:05
What we have doneDONE
但若用我們
05:07
is we have developed發達 a technology技術
開發出來的這種技術呢?
05:09
with which哪一個 we can furthermore此外
首先把這個遙控器裡的LED換掉
05:12
replace更換 the remote遠程 control控制 of our light bulb燈泡.
換成加入了我們的技術的LED
05:15
We transmit發送 with our technology技術,
用它來傳,不只是單一資料流
05:17
not only a single data數據 stream,
用它來傳,不只單一資料流
05:19
we transmit發送 thousands數千 of data數據 streams
而是上千筆資料流
05:21
in parallel平行,
平行,同步地傳
05:23
at even higher更高 speeds速度.
並且速度更快
05:25
And the technology技術 we have developed發達 --
這種技術叫做
05:27
it's called SIMSIM卡 OFDMOFDM.
SIM OFDM
05:29
And it's spacial空間 modulation調製 --
是利用到第三維的「空間調變」技術
05:31
these are the only technical技術 terms條款, I'm not going into details細節 --
技術細節在此點到為止
05:33
but this is how we enabled啟用
總之,我們應用這種技術來
05:36
that light source資源
以光線
05:38
to transmit發送 data數據.
作無線傳輸用途
05:40
You will say, "Okay, this is nice不錯 --
你會說,了不起
05:43
a slide滑動 created創建 in 10 minutes分鐘."
10分鐘就搞定的一個簡報,誰知道真假?
05:46
But not only that.
所以,不只說說而已
05:48
What we've我們已經 doneDONE
我們做了
05:50
is we have also developed發達 a demonstrator示威者.
一個現場示範機
05:52
And I'm showing展示 for the first time in public上市
這是首度在公開場合曝光的
05:55
this visible可見 light demonstrator示威者.
一個可見光展示機台
05:57
And what we have here
上面這是
05:59
is no ordinary普通 desk lamp.
一隻普通檯燈
06:01
We fit適合 in an LED light bulb燈泡,
裡頭改裝一顆LED燈泡
06:04
worth價值 three U.S. dollars美元,
價值美金3塊錢
06:06
put in our signal信號 processing處理 technology技術.
燈泡裡面加上了信號處理技術
06:09
And then what we have here is a little hole.
這裡有個小洞
06:11
And the light goes through通過 that hole.
檯燈的光穿過這洞
06:14
There's a receiver接收器.
抵達下面的接收機
06:16
The receiver接收器 will convert兌換 these little, subtle微妙 changes變化 in the amplitude振幅
接收機將微小的振幅變化
06:18
that we create創建 there
-就是我們所賦予它的變化
06:21
into an electrical電動 signal信號.
轉換為電子訊號
06:23
And that signal信號 is then converted轉換 back
電子訊號又被轉換成資料流
06:25
to a high-speed高速 data數據 stream.
高速資料流
06:27
In the future未來 we hope希望
未來我們希望能
06:29
that we can integrate整合 this little hole
將這個小洞
06:31
into these smart聰明 phones手機.
整合到智慧手機裡
06:33
And not only integrate整合 a photo照片 detector探測器 here,
不僅是整合一個光偵測器
06:36
but maybe use the camera相機 inside.
而可能是借用到裡面的照相模組
06:39
So what happens發生
所以現在把燈炮打開
06:43
when I switch開關 on that light?
會發生什麼事?
06:45
As you would expect期望,
當然啦,把書本攤開
06:50
it's a light, a desk lamp.
在一盞燈底下,一定可以閱讀
06:52
Put your book beneath下面 it and you can read.
它是個燈
06:54
It's illuminating照明 the space空間.
燈泡有照亮環境的功能
06:57
But at the same相同 time, you see this video視頻 coming未來 up here.
但同時它也在傳送一個影片
06:59
And that's a video視頻, a high-definition高清 video視頻
這個高解析度的影片
07:03
that is transmitted發送 through通過 that light beam光束.
是透過光束傳送的
07:06
You're critical危急.
或許你有點存疑
07:08
You think, "Ha, ha, ha.
心裡想:哈哈,這只是
07:10
This is a smart聰明 academic學術的 doing a little bit of tricks技巧 here."
一位聰明的大學教授在台上玩障眼法吧
07:12
But let me do this.
不過,我證明給你看
07:15
(Applause掌聲)
(掌聲)
07:19
Once一旦 again.
還不相信的話
07:24
Still don't believe?
再來一次
07:27
It is this light
真的是這個光
07:30
that transmits發送 this high-definition高清 video視頻 in a split分裂 stream.
在傳輸這支高解析度的影片,以分流的方式
07:32
And if you look at the light,
所看到的光線
07:36
it is illuminating照明 as you would expect期望.
卻和你居家用來照明的光一樣
07:39
You don't notice注意 with your human人的 eye.
肉眼察覺不出任何不同
07:41
You don't notice注意 the subtle微妙 changes變化 in the amplitude振幅
我們其實透過燈泡在這光裡壓縮了
07:43
that we impress onto this light bulb燈泡.
一些極微小的振幅變化
07:46
It's serving服務 the purpose目的 of illumination照明,
它既提供照明
07:49
but at the same相同 time, we are able能夠 to transmit發送 this data數據.
同時也傳輸資料
07:51
And you see,
即便天花板
07:54
even light from the ceiling天花板 comes down here to the receiver接收器.
有好多燈泡的光打下來在講台這邊
07:56
It can ignore忽視 that constant不變 light,
接收機卻可以忽略那些連續性光源
07:59
because all the receiver's接收器的 interested有興趣 in
因為它只對
08:02
are subtle微妙 changes變化.
有著特定的微小頻段變化的部分有反應
08:04
You also have a critical危急 question now, and
您或許還有些這樣那樣挑剔的問題
08:09
you say, "Okay,
「那我們豈不是
08:11
do I have to have the light on all the time
不能關燈啦
08:13
to have this working加工?"
不然它就不工作了,是嗎?」
08:15
And the answer回答 is yes.
答案是:沒錯。
08:17
But, you can dim暗淡 down the light
不過,可以把燈光轉得很暗
08:19
to a level水平 that it appears出現 to be off.
只要很暗就行,不用全關
08:23
And you are still able能夠 to transmit發送 data數據 -- that's possible可能.
這樣資料還是會繼續傳輸,是可行的
08:25
So I've mentioned提到 to you the four challenges挑戰.
所以我已經跟各位介紹過四個無線通訊的瓶頸
08:28
Capacity容量:
1. 承载量
08:31
We have 10,000 times more spectrum光譜,
有1萬倍的頻寬
08:33
10,000 times more LEDs發光二極管
用LED的話
08:35
installed安裝 already已經 in the infrastructure基礎設施 there.
而其基礎設施已經是現成的
08:37
You would agree同意 with me, hopefully希望,
相信各位能同意我的看法:
08:39
there's no issue問題 of capacity容量 anymore.
也就是,承载量不再是問題
08:41
Efficiency效率:
其次,節能
08:43
This is data數據 through通過 illumination照明 --
這是運用燈具傳資料
08:45
it's first of all an illumination照明 device設備.
燈是基本一定要開的
08:47
And if you do the energy能源 budget預算,
這樣一來你算能源開銷時
08:49
the data數據 transmission傳輸 comes for free自由 --
資料傳輸項目等於免費
08:52
highly高度 energy能源 efficient高效.
高節能,費用低
08:54
I don't mention提到 the high energy能源 efficiency效率
還不提LED燈本身就是高度節能的燈具
08:56
of these LED light bulbs燈泡.
要是全世界都改裝
08:58
If the whole整個 world世界 would deploy部署 them,
LED燈具的話
09:00
you would save保存 hundreds數以百計 of power功率 plants植物.
發電廠可以關掉幾百座
09:02
That's aside在旁邊.
那是題外話
09:05
And then I've mentioned提到 the availability可用性.
繼續往下,可用性
09:07
You will agree同意 with me that we have lights燈火 in the hospital醫院.
相信您必定同意,醫院也要開燈
09:09
You need to see what to do.
否則就伸手不見五指啦
09:12
You have lights燈火 in an aircraft飛機.
飛機上也要開燈,照樣
09:14
So it's everywhere到處 in a day there is light.
到處都有燈光
09:16
Look around. Everywhere到處. Look at your smart聰明 phone電話.
看一下,到處,包括智慧手機
09:18
It has a flashlight手電筒, an LED flashlight手電筒.
還都裝上了手電筒,也是LED手電筒
09:21
These are potential潛在 sources來源 for high-speed高速 data數據 transmission傳輸.
全都是可以用來當做高速資料傳輸的設備
09:23
And then there's security安全.
最後,資料內容安全性
09:27
You would agree同意 with me
這很簡單
09:30
that light doesn't penetrate穿透 through通過 walls牆壁.
光總不會穿透牆壁吧
09:32
So no one, if I have a light here,
所以如果我在這裡
09:35
if I have secure安全 data數據,
用這光傳機密資料
09:37
no one on the other side of this room房間 through通過 that wall
隔牆的人是不可能
09:39
would be able能夠 to read that data數據.
讀得到這資料的
09:41
And there's only data數據 where there is light.
非要有光才能收資料
09:43
So if I don't want that receiver接收器 to receive接收 the data數據,
那要是我不想讓接收器收到資料
09:46
then what I could do,
我可以
09:50
turn it away.
把燈轉個頭
09:54
So the data數據 goes in that direction方向, not there anymore.
轉一個方向,資料朝向那邊,接收器就收不到了
09:57
Now we can in fact事實 see where the data數據 is going to.
現在我們其實可以看到資料會去向哪個方向
09:59
So for me,
對我而言
10:05
the applications應用 of it,
這個技術的應用
10:08
to me, are beyond imagination想像力 at the moment時刻.
是遠比想像的還美好
10:11
We have had a century世紀 of very nice不錯, smart聰明 application應用 developers開發商.
我們已有許多很棒的智慧產品應用開發商
10:15
And you only have to notice注意, where we have light,
只要注意哪裏有燈
10:19
there is a potential潛在 way to transmit發送 data數據.
哪裡就有潛在應用
10:22
But I can give you a few少數 examples例子.
我可以跟各位講其中一些應用
10:25
Well you may可能 see the impact碰撞 already已經 now.
你現在已經可以看出其中一些影響力
10:28
This is a remote遠程 operated操作 vehicle車輛
這是一艘遙控運輸器
10:32
beneath下面 the ocean海洋.
在海底
10:34
And they use light to illuminate照亮 space空間 down there.
所以必須有燈光來提供照明
10:36
And this light can be used to transmit發送 wireless無線 data數據
而這個燈就同時也能負責傳輸資料
10:39
that these things [use] to communicate通信 with each other.
這些運輸器彼此之間也就能通訊
10:41
Intrinsically本質 safe安全 environments環境
極端要求安全的場所
10:44
like this petrochemical石化 plant --
比方是這座石油化學廠
10:46
you can't use RFRF, it may可能 generate生成 antenna天線 sparks火花,
你不能用無線電,它有可能使天線爆出火花
10:48
but you can use light -- you see plenty豐富 of light there.
但是光,沒這個麻煩,圖中已看到不少的燈在那兒
10:51
In hospitals醫院,
醫院
10:54
for new medical instruments儀器;
新的醫療設備
10:56
in streets街道 for traffic交通 control控制.
街道上的交通號誌
10:59
Cars汽車 have LED-based基於LED headlights頭燈, LED-based基於LED back lights燈火,
很多車子如今都是配備LED的頭燈和尾燈
11:02
and cars汽車 can communicate通信 with each other
車輛之間彼此可以通訊
11:05
and prevent避免 accidents事故
可以預防事故
11:07
in the way that they exchange交換 information信息.
如果它們彼此交換著資訊的話
11:10
Traffic交通 lights燈火 can communicate通信 to the car汽車 and so on.
紅綠燈也能對車輛通訊
11:13
And then you have these millions百萬 of street lamps燈具
街燈,少說也有幾百萬盞
11:16
deployed部署 around the world世界.
全世界總量
11:19
And every一切 street lamp could be a free自由 access訪問 point.
要是每盞街燈都變成一個存取點
11:22
We call it, in fact事實, a Li-Fi李網絡,
我們稱之為Li-Fi
11:24
light-fidelity光高保真.
光傳真(相對於Wi-Fi,無線高傳真)
11:26
And then we have these aircraft飛機 cabins小屋.
飛機座艙
11:28
There are hundreds數以百計 of lights燈火 in an aircraft飛機 cabin,
至少也有幾百盞個別的小燈
11:32
and each of these lights燈火
每一盞小燈
11:36
could be a potential潛在 transmitter發射機 of wireless無線 data數據.
都可以成為無線資訊的潛在傳輸器具
11:38
So you could enjoy請享用 your most favorite喜愛 TEDTED video視頻
這樣你就可以享受最棒的TED演講影片
11:41
on your long flight飛行 back home.
在回家途中的飛機上
11:44
Online線上 life. So that is a vision視力, I think, that is possible可能.
這就是未來的網路生活。我認為這個理想在未來是可行的
11:46
So, all we would need to do
我們需要做的只是
11:55
is to fit適合 a small microchip微芯片
把一顆微晶片放到
11:57
to every一切 potential潛在 illumination照明 device設備.
每個可能成為傳輸體的燈具裡
11:59
And this would then combine結合
這會結合
12:02
two basic基本 functionalities功能:
兩個基本功能
12:05
illumination照明 and wireless無線 data數據 transmission傳輸.
照明和無線資料傳輸
12:07
And it's this symbiosis合作關係 that I personally親自 believe
正是這種共生關係,我個人認為
12:09
could solve解決 the four essential必要 problems問題
可以化解決前述四大問題
12:12
that face面對 us in wireless無線 communication通訊 these days.
是今日無線通必須面對的
12:14
And in the future未來,
未來
12:17
you would not only have 14 billion十億 light bulbs燈泡,
您將不只有140億顆燈泡
12:19
you may可能 have 14 billion十億 Li-Fis李度音響
而是有140億座"Li-Fi"存取點
12:22
deployed部署 worldwide全世界 --
全球各處都有
12:25
for a cleaner清潔器, a greener更環保,
更乾淨更環保
12:27
and even a brighter光明 future未來.
更亮更美好的未來
12:29
Thank you.
謝謝
12:31
(Applause掌聲)
(掌聲)
12:33
Translated by Lauren Huang
Reviewed by Geoff Chen

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About the speaker:

Harald Haas - Communications technology innovator
Harald 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."

More profile about the speaker
Harald Haas | Speaker | TED.com