LONG distance control
 

Need to pick your collective brains about extreme long distance PTZ camera control. Here's the situation:

We're collaborating with a race track & were trying to put together a centrally controlled camera system where the control room might be up to .75 miles away from the farthest camera. The good news is that the track is putting up several camera towers that have single mode fiber running to them terminating in the building we're planning on setting up in. I'm trying to find 2 things.

1) a remote head that can be adapted for control over fiber
2) some way to control focus, zoom, iris over fiber

Can anyone point me in the right direction here? I've done some searching around and am having a hard time finding anything on the subject. Maybe this is a question for a broadcast engineer's forum?