TED Talks2015.12.2---Harald Haas :迎接Li-Fi無線上網

TED Talks2015.12.2---Harald Haas :迎接Li-Fi無線上網
發佈日期：2015年12月2日
What if we could use existing technologies to provide Internet access to the more than 4 billion people living in places where the infrastructure can't support it? Using off-the-shelf LEDs and solar cells, Harald Haas and his team have pioneered a new technology that transmits data using light, and it may just be the key to bridging the digital divide. Take a look at what the future of the Internet could look like.
如果我们可以利用现有的技术来提供互联网接入超过4十亿人生活在地方的基础设施无法支持它？使用过的，现成的LED和太阳能电池，哈拉尔德·哈斯和他的团队已经开创了一种新技术，利用光传输数据，它可能只是关键弥合数字鸿沟。看看互联网的未来可能是什么样子。

0:07I would like to demonstrate for the first time in public it is possible to
0:17transmit video from a standard off the shelf led to a Dell laptop acting as a
0:28receiver but there's no wifi involved is just light and you may wonder what's the
0:34point and the point is this would be a massive expansion of the Internet to
0:41close the digital divide and also to allow for what we call the Internet of
0:47Things tens of billions of devices connected to the Internet in my view
0:51such an extension of the Internet can only work if it's almost energy neutral
0:57this means you need to use existing infrastructure as much as possible and

1:03this is where the fullest and the LED comment I demonstrated for the first
1:10time in 10 2011 life I or like fidelity life I uses off-the-shelf LEDs the
1:19transmitted data incredibly fast and also in a safe and secure manner
1:25data is transported by Adelaide recorded in subtle changes of the brightness if
1:32you look around we have many LEDs around us is a rich infrastructure of life I
1:39transmitters around us but so far we have been using special devices small
1:44photodetectors to receive the information included in the data I
1:51wanted to find a way to also use existing infrastructure to receive data
1:56from our life nights and this is why I have been looking into solar cells and

2:01solar panels solar cell absorbs light and converted into electrical energy can
2:09use a solar cell
2:11to charge a mobile phone but now we need to remember that data is encoded in
2:17subtle changes of the brightness of the LED so if the incoming light fluctuate
2:23sawdust the energy harvested from the solar cell this means we have a
2:29principal mechanism in place to receive information from the light and by the
2:37solar cell because the fluctuations of the energy harvested correspond to the
2:41data transmitted of course the Christmas can be receive very fast and subtle
2:48changes of the brightness such as the transmitted by by our LED lights and the
2:55answer to that is yes we can we have shown that we can receive up to 50

3:02megabits per second from a standard off the shelf in this is faster than most
3:08broadband connections days now let me show you in practice in this box is a
3:18standard off the shelf this is a standard off the shelf it is connected
3:26to the laptop and also may have an instrument here to visualize the energy
3:33harvest from the solar cell and since remained shows something at the moment
3:37it is already harvest slide from the ambient light know what I would like to
3:44do first is switched on the light simply only switch on the light at the moment
3:48and what do you notice is that the instrument chance to write for a solar
3:55cell at the moment is harvesting energy from this artificial light source of me

4:03drops we harvest energy with the solar cell but next I would like to activate
4:10the streaming of the video and I've done this by pressing this button for now
4:18this LED lamp is streaming video by changing the brightness of the
4:24in a very subtle way in a way that you can't recognize that you are because the
4:29changes are too fast to recognize that in order to prove the point I can block
4:36the light of the solar cell so first we noticed the energy harvesting crops in
4:43the video stops to smell to remove the blockage the video restart and I
4:54that so we stop the transmission of the video and energy harvesting stops as

5:01well that is to show that acts as a receiver but now imagine this led Lamba
5:10streetlight and they spoke to simulate fork and that's why I brought a
5:17handkerchief with me and let me put the chief of the energy harvested crop is
5:30expected but no video still continues this means despite the blockage a
5:37sufficient light coming through the handkerchief to the solar cell phone at
5:41the solar cell is able to decode and stream that information in that case a
5:47high-definition video what's really important here is that a solar cell has
5:54become a receiver for high-speed wireless signals recorded in lights
5:59while it maintains its primary function as an energy harvesting device that's

6:06why it is possible for use existing solar solar cells on the rules of our
6:11hearts to act as a broad band receiver from a later station on a close by year
6:17or indeed lamppost and it really doesn't matter where the beam hit the solar cell
6:22and the same is true for translucent auto sales integrated into Windows
6:28integrated into street furniture or indeed
6:33integrated into these billions of devices that is from the Internet of
6:38Things because simply don't want to charge devices regularly or vers replace
6:43the batteries every few months as I said to you before the first time I've shown
6:49in public it's very much a lot demonstration prototype but my team and
6:55I are confident that we can take this to market within the next two to three
6:58years and we hope you will be able to contribute closing the digital divide in

7:05also contribute to connecting
7:07all these billions of devices to the Internet and all of this without causing
7:11a massive explosion of energy consumption because of the solar cells 7:15by Java city thank you


0:00翻译人员: Ziyu Zhao 校对人员: Yunjia Zhang
0:12我想要第一次向公众证明
0:16视频可以由一台LED台灯
0:24传送至太阳能电池板上， 并由一台手提电脑接收
0:30没有Wi-Fi介入，只是光
0:33那么你可能想知道， 这样做有什么意义？
0:35意义就是：
0:38将来互联网会大规模覆盖
0:41“数字鸿沟“将不复存在
0:43并且让我们所说的“物联网”变为可能——
0:48数以亿计的设备连接到互联网
0:51在我看来，互联网的大程度扩张
0:54前提是需要基本保证“能源中性化” （指尽量减少能源消耗）
0:58这就是说， 我们需要 尽可能的多用现存的基础设施

1:03这就是为什么前面提到太阳能电池和LED
1:08我之前第一次证明这件事
1:11是2011年在TED演讲
1:13我称它为Li-Fi，即光保真
1:15用现存的LED灯可以极快地传递Li-Fi数据
1:21并且这种方式安全可靠
1:25数据由光传输
1:28由亮度的细微变化解码
1:32如果我们环视四周，在我们身边有很多的LED灯
1:35因此在我们周围有着非常丰富的Li-Fi发射装置
1:41但是目前，我们通常使用一个特别的设备—— 小型照片探测器
1:46来接收由数据解码出来的信息
1:50我想要找到一种方法，利用现有的基础设施
1:54来接收Li-Fi灯发出的数据
1:58这也是为什么我一直研究 太阳能电池和太阳能电板

2:03太阳能电池吸收光并转化成电能
2:08这就是为什么我们能用 太阳能电池给我们的手机充电
2:13但我们知道
2:14数据是由LED亮度的微妙变化来编码的
2:21所以如果入射的光有波动
2:24那么太阳能电池收集的能量也有波动
2:28这就意味着我们具备了一项基本原理：
2:32信息通过光的传导，由太阳能电池板接收
2:38因为收集的能量波动 与传输的数据相对应
2:43当然问题就在
2:46我们是否能够收集到 非常迅速和微小的亮度变化
2:50比如通过我们的LED灯传递的那种
2:54答案是 是的，我们可以
2:58我们在实验室已经展示

3:00我们能够接收达到每秒50MB的数据
3:03通过一个标准的，现有的太阳能电池
3:06这比目前最高速的宽带连接还要快
3:11现在让我来实践展示一下
3:17在这个盒子里，是一个现有的标准LED灯
3:23这是一个现有的标准太阳能电池
3:25它连接到笔记本电脑上
3:28这儿我们还有一个测量仪
3:31用来显示我们从太阳能电池收集的能量
3:35现在这个仪表上有读数
3:37这是因为太阳能电池 已经开始从周围环境收集光了
3:43现在，首先我将把灯打开
3:45只是简单的打开灯，等一段时间
3:50你会注意到指针跳到了右边
3:54所以现在 太阳能电池 正在从这个人工光源接收能量

4:00如果把它关掉，我们看到读数降回去了
4:03再打开
4:05所以我们用太阳能电池收集了能源
4:08接下来， 我将要启动视频传导
4:15通过按下这个按钮来实现
4:17所以现在这个LED灯正在通过亮度的细微变化传导一个视频
4:26这种亮度变化太快，不能用肉眼识别
4:33为了证明这一点
4:35我可以阻挡太阳能电池接收的光
4:40首先你会注意到收集的能源下降了
4:43并且视频也停止了
4:45如果我移开阻碍物， 视频会继续播放
4:49（掌声）
4:55这个操作可以重复
4:57所以当我们阻止视频的传输 能源收集也相应停止

5:03这说明太阳能电池可以作为一个接收器
5:08但是现在想像一下这个LED灯是街灯 并且周围有雾
5:14我想模拟有雾的情况
5:16因此我随身带来一个手帕
5:19（笑声）
5:20让我把手帕放到太阳能电池上
5:25首先你会注意到
5:27能源收集量降低了，和预料的一样
5:31但是现在视频仍在继续播放
5:34这意味着，尽管有阻碍物
5:37还是有足够的光穿过手帕到太阳能电池
5:41因此太阳能电池仍然 能够解码、传导数据信息
5:46甚至是我们现在用的高清视频信息
5:51重要的是 太阳能电池 在这里成为了一个接收器
5:56接收编码成光的高速无线信号

6:00同时也保持了它作为 能源收集设备的基本功能
6:05这就是说，屋顶上那些现有的太阳能电池
6:12可以用来作为宽带网络的接收器
6:14信号可以来自靠近山坡的 激光站，或者街边的路灯
6:19哪里的光束到达太阳能电池并不要紧
6:23并且实际上
6:24窗户上安装的半透明太阳能电池
6:28安装在街道设施上的太阳能电池
6:32甚至安装在成千上万 其他设备上的太阳能电池
6:36它们将会形成物联网
6:38这是因为我们不想经常给这些设备充电
6:42更不想每几个月就要更换电池
6:46我之前说
6:48这是我第一次向公众展示这些
6:50这次展示可以说是一个实验证明
6:52一个原型
6:54但是我和我的团队有信心 接下来两到三年，这项产品会进入市场

7:00希望我们能够对终结“数字鸿沟”做出贡献
7:05并且帮助成千上万的设备连接到互联网
7:10而且所有设备不会造成巨大的能源消耗
7:14因为我们将利用现有的太阳能电池
7:16谢谢
7:17（掌声）