Awhile ago I reviewed and noted the speed of light as a constant, although “a popular misconception is that, according to Einstein’s special theory of relativity, nothing in the universe can travel faster than this speed.”

Which is to say that scientists have been working to speed up and slow down the speed of light. A team of scientists led by Luc Thévenaz is using optical fibers in a technique called Stimulated Brillouin Scattering to alter the relationships of the phase velocities within a pulse of light. Different frequency components exist and either they move at the same group velocity or they don’t but it’s possible to create the illusion that the pulse is moving faster than light.

These experiments don’t use special media and there are possible implcations in the telecommunications field.