Optical Fiber, Silicon Core

Scientists at Clemson University for the first time have been able to make a practical optical fiber with a silicon core, according to the Optical Society of America (OSA).

The ability to produce silicon fibers commercially would create the opportunity for more compact devices with decreased power consumption and help increase efficiency in telecommunications and other systems that integrate photonic and electronic devices.

Optical fibers carry an increasing fraction of phone calls, television programs and Internet traffic. The main advantage of using optical fibers is higher bandwidth, which means faster downloads from the Web, for example.

Led by John Ballato, professor at Clemson, and including fiber pioneer Roger Stolen, the team was able to create this new fiber by employing the same commercial methods that are used to develop all-glass fibers, making silicon fibers viable alternatives to glass fibers for selected specialty applications.

"In essence, we've married optoelectronics with optical fibers," said Ballato. "In the past, we've needed one structure to process light and another to carry it. With a silicon fiber, for the first time, we have the ability to greatly enhance the functionality in one fiber."

Usually an optical fiber is made by starting with a glass core, wrapping it with a cladding made from a slightly different glass, and then heating the structure until it can be pulled out into long wires. This works well enough, but for some wavelengths of light, a core made of pure crystalline silicon, like the one developed by the Clemson team, would better carry signals.

Additionally, crystalline silicon exhibits certain nonlinear properties (in which the output is not proportional to the input) that are many orders of magnitude larger than for conventional silica glass. This would, for example, allow for the amplification of a light signal or for the shifting of light from one wavelength to another. The development of a silicon fiber opens the way for signal processing functions that are currently done electronically or in separate optical circuits to be performed directly inside the fiber, which allows for more compact, efficient systems.

Some fibers have been made with a silicon core, but the Clemson version (with collaborators at UCLA, Northrop Grumman and Elmira College) is the first to employ standard mass-production methods, bringing them closer to commercial reality.

Right now the amount of energy lost when the light waves move down this silicon fiber is no better than for other fibers at the longer wavelengths, but Ballato says that the work so far has been a proof-of-concept, and he expects energy losses to decline significantly with continued optimization.

For more information, visit: www.clemson.edu