How hard would it be to modify the Ethernet Shield to support SFP modules?
I'm working on a project where the Arduino would be installed in a cabinet with 480V 3Phase AC power. I can't bring low voltage (Ethernet) out of the cabinet. A Fiber Ethernet connection to an SFP would be perfect.
I also need to find some optic couplers so I can link Arduinos between cabinets via fiber. Arduino1.DIgital10 -> Arduino2.Digital10 so I can send signals between the two.