Signal image transmitter

Hi,

I want to build a signal image transmitter which can transmit at least 50 kilobyte across 1 kilometer. Which would be better and what would be the safest to use - SNR or CNR? Also would like to experiment first on a data rate of sending 50 kb for 1 - 5 seconds. I know that the more power pushed through the more quicker the data will travel and the image will appear on the other side. Any help you guys can give me is well appreciated.

Thanks

Read my friend Clint's Optical Communication website

Power does not affect travel speed... more power means a stronger signal further away, but will not increase the rate at which the signal propagates through space.