Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsLight in a Fiber Optic Cablehttp://demonstrations.wolfram.com/LightInAFiberOpticCable/]]>http://demonstrations.wolfram.com/LightInAFiberOpticCable/