Scientists twist light to send data at more than 2 terabits per second
June 27, 2012
A multinational team led by USC with researchers in the U.S., China, Pakistan, and Israel has developed a system of transmitting data using twisted beams of light at ultra-high speeds — up to 2.56 terabits per second.
Broadband cable supports up to about 30 megabits per second. The twisted-light system transmits about 85,000 times more data per second.
Their work might be used to build high-speed satellite communication links, short free-space terrestrial links, or potentially be adapted for use in the fiber optic cables that are used by some Internet service providers.
“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. Willner and his colleagues used beam-twisting “phase holograms” to manipulate eight beams of light so that each one twisted in a DNA-like helical shape as it propagated in free space. Each of the beams had its own individual twist and can be encoded with “1″ and “0″ data bits, making each an independent data stream.
Their demonstration transmitted the data over open space in a lab, attempting to simulate the sort of communications that might occur between satellites in space. Among the next steps for the research field will be to advance how it could be adapted for use in fiber optics, like those frequently used to transmit data over the Internet.
“We didn’t invent the twisting of light, but we took the concept and ramped it up to a terabit-per-second,” Willner said. His team included Jian Wang *(now with Huazhong University of Science and Technology in China), Jeng-Yuan Yang, Irfan M. Fazal, Nisar Ahmed, Yan Yan, Hao Huang, Yongxiong Ren and Yang Yue from USC; Samuel Dolinar from NASA’s Jet Propulsion Laboratory; and Moshe Tur from Tel Aviv University.
Ref.: Alan Willner, et al., A new twist for communications, Nature Photonics, 2012; DOI:10.1038/nphoton.2012.151