Direct measurement of superluminal group velocity and of signal velocity   in an optical fiber
  We present an easy way of observing superluminal group velocities using a birefringent optical fiber and other standard devices. In the theoretical analysis, we show that the optical properties of the setup can be described using the notion of "weak value". The experiment shows that the group velocity can indeed exceed c in the fiber; and we report the first direct observation of the so-called "signal velocity", the speed at which information propagates and that cannot exceed c. 
Nicolas Brunner, Valerio Scarani, Mark Wegmuller, Matthieu Legre and   Nicolas Gisin