I was watching the Silicon Photonics demo Intel posted (http://www.youtube.com/watch?v=vz3DaACN_54&feature=player_embedded) and I got interested in how data is stored in electrons/light. I previously thought that a "1" or "0" was sent to a chip depending on if the light was on or off. However this photonics demo looks different. He described muxing/demuxing process as taking a whole bunch of different wavelength of light, with data "in" them and sending them through a wire. I am guessing a different wave length (for example 400nm-405nm = 1 and 405nm-410nm = 0) would denote the data but I cannot find any articles that back up my claim for this process. Also, I realized that I have no idea how data travels over copper, nor do I know where to begin (I probably don't know much about electricity, but I don't know how you can have a signal in a copper wire when electrons are just flowing). I hope my questions are not too poorly worded and if anyone can help me wrap me head around this it would be a huge help.