Total posts : 45366
What kind of bandwidth do you think could be carved out of a UV beam?
Limiting this answer to the use of components inexpensively and readily available to hobbyists I would estimate a bandwidth of 20 to 30 kHz for an optical link. I chose UV for my project so it could operate in the presence of ambient light which has relatively low UV. Otherwise there was nothing special about using UV for this.
There is a trade-off between bandwidth and receiver sensitivity. I worked on a high speed sensing system where we had to use phototransistors for the detector and 30 kHz was the max frequency that we could use. Use of photo diodes gave higher frequency but the sensitivity was not adequate. This project was constrained by cost and 30 kHz was adequate.
An IR laser could be used but solid state lasers require current control circuitry and present a possible danger with the concentrated beam.
For someone who wants to home brew a link I suggest using IR or visible LEDs and phototransistors. With proper focusing a hundred foot range should obtainable.