Any kind of data speed will require a phototransistor (or photodiode) and some kind of amplifier.

Check out Figure 7 of
http://www.physics.csbsju.edu/~awhit...otodevices.pdf

This circuit would have to be followed with an op-amp or (preferably) a comparator to convert the analog output to digital.

Also -
http://www.aptechnologies.co.uk/PDF/...20Circuits.pdf