Does anyone know if there is any manufacturer for the modulatable laser drivers, capable of directly modulating VCSEL , 850nm, with RF signal of 3.96 GHz (UWB standard)?
I dont think you need any laser driver circuits, all you need is a bias-tee, and electrical amplifier if you need higher electrical power. As long as your electrical lines are impedance matched for 50 Ohm, then you will be fine, else you will need a matching network.