Heh. I've just purchased an Optimum DRO5-RH read head in the hope of using it with a TouchDRO setup. I cut off the connector, and the wire colours match up with what's printed on this sensor (which looks identical to mine, except mine is gold-coloured, and branded Optimum).
https://4.bp.blogspot.com/-6C3DA4A6H...nnectors-3.jpg
However, the signal off the A and B outputs (and their complements) are very low - with a 5V supply, I was kind of expecting that kind of voltage, but the amplitude is more like 75mV, so I'm not sure if my supply voltage is way too low, or if these particular sensors are meant to have their outputs amplified...