A research team at the University of Southampton in England has built a fiber cable that is capable of carrying data at 99.7 percent of the vacuum-speed of light. They have done so, they report in their paper published in the journal Nature Photonics, by constructing a cable with a hollow core and special inner walls that prevent refraction.
Fiber cables technically at least, carry data at the speed of light (299,792,458 meters per second in a vacuum), because the media they carry, is in fact a beam of light. But, in practice, data is carried far slower than that because of latency delays caused by refraction as light moves through the silica glass, which reduces common fiber cable data rate throughput by approximately 31 percent. To get around this problem, researchers have been looking at ways to replace the core of the fibers with air, which suffers far less from refraction. The stumbling point has been how to get the light beams moving through the cables to follow the cable when bends and turns are encountered. That’s where this new research comes in—the group has found a new way to build a hollow core fiber cable that allows for bending light as it moves around turns while minimizing loss due to refraction.
Read more at: Phys.org