SAT2物理学习资料-英文物理资讯翻译

2012年06月27日，分类：SAT Physics Subject Test （物理SAT）；标签归档: SAT

本文是由博主王尚编译，原文来自国外最权威的物理网（physics.org），本文谢绝任何形式的转载。仅供SAT2物理学习参考，比较生僻和比较重要的词，笔者在文章最后予以归纳。

标题

通过扭动光束，数据传输速度达到2.56 Tb / s

Data transmission speed of 2.56 Tb/s achieved by twisting beams of light

twisted_light

正文

值得庆幸的是，从当初拨号以来，数据传输速度已经走了很长的路。（早期）那个时候，在等待一个图像或MP3的下到他们的硬盘，用户们都有足够的时间地玩弄自己的大拇指。这些天，有线宽带目前支持速度大约是30兆位每秒，这是一个地狱的改进。现在，研究人员已经超越了它，一个因素就是约85000人通过使用扭曲的光束的传输数据，达到2.56兆兆位每秒。

Thankfully, data transmission speeds have come a long way since the days of dial-up when users would have plenty of time to twiddle their thumbs as they waited for an image or MP3 to make its way to their hard drive. These days, broadband cable currently supports speeds of around 30 megabits per second, which is a hell of an improvement. Now researchers have outdone that by a factor of around 85,000 by using twisted beams of light to transmit data at up to 2.56 terabits per second.

【批注】个人感觉原文中“These days, broadband cable currently ”中“These days”与“ currently ”有点语法冲突。

系统是由南加州大学(USC)领导的跨国团队开发，（系统）包含数据以超光速通过扭曲的光束传导。使用beam-twisted“阶段的全息图，”他们操纵八束光线好让每个人在一个DNA状螺旋形状扭曲，因为它传播自由的空间。每道光束具有其自己的转折，可以编码与“1”和“0”数据位，他们成立了八个独立的数据流。

The system developed by the multi-national team led by the University of Southern California (USC) involved transmitting data twisted beams of light at ultra-high speeds. Using beam-twisted “phase holograms,” they manipulated eight beams of light so that each one twisted in a DNA-like helical shape as it propagated in free space. With each beam having its own twist that can be encoded with “1” and “0” data bits, they formed eight independent data streams.

因为该系统可以在高速卫星连接通信信号，他们试图模拟可能发生的那种通讯卫星在太空之间传输数据在开放的空间实验室。该系统也有可能被用于短空间陆地链接，或者是可以适用于像一些互联网服务提供商（目前在）用的光纤电缆。

Because the system could be used in high-speed satellite communication links, they attempted to simulate the sort of communications that might occur between satellites in space by transmitting data over open space in a lab. The system also has the potential to be used in short free-space terrestrial links, or to be adapted for use in fiber optic cables like those used by some Internet service providers.

虽然距离数据传输速度达到每秒26兆兆位的世界纪录还很远，世界纪录是由一组来自德国卡尔斯鲁厄理工学院(KIT)保持的，但最近的努力仍令人印象深刻。

While not quite at the world record-breaking data transmission speed of 26 terabits per second achieved last year by a team from Germany’s Karlsruhe Institute of Technology (KIT), the latest effort is still impressive.

“你能做的事情利用的是光，而这些光不用电力，”南加州大学工程学院的电子工程工程系教授Alan Willner说道，“我们并没有发明扭转的光，但是我们利用了这个概念并将其扩大到了兆兆位每秒（的数据传输速度）。”

“You’re able to do things with light that you can’t do with electricity,” said Alan Willner, electrical engineering professor at the USC Viterbi School of Engineering. “We didn’t invent the twisting of light, but we took the concept and ramped it up to a terabit-per-second.”

Willner是文章作者，其一篇关于这项研究于6月24日发表在《自然光子学》杂志。

Willner is the author of an article about the research that was published in Nature Photonics on June 24.

英文原文http://www.gizmag.com/twsited-light-data-transmission/23096/

本文源于王尚物理博客。在SAT学习中的关键词语归纳如下：

dial-up

twisting beams of light

broadband cable

terabits per second

twiddle their thumbs

ramped it up to

be adapted for use in fiber optic cables

推荐一位教授物理SAT的老师，北京市海淀区排名前五高中任教，教学能力绝对过关。