Light and electricity are different. 
A copper wire is full of atoms at all times.
When you push an electron into one end, it pushes out an electron at the other end. 
With light, if you push a photon, the same photon exits at the other end.

Have you ever needed to talk or transmit through the walls or across the state? Designs for voice, data, video, RF, local and wide area networks at speeds up to the limits of imagination. Whether you need microwave, lasers, or fiber optics, from conventional 56K up though terabits/sec are a reality and just the tip of the iceberg! 

Indoor reception is limited by distance to the outdoor transceiver site and the make-up of the structure itself. 
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