aww cmon.... you have to do better than that...
either use Code button or paste as picture.
i just found one old pcb of what used to be wheel mouse so it has
three sets of sensors.
emitter is just clear LED. electrodes inside it are different length.
shorter one is anode according to silkscreen and orientation of caps.
receiver (3-wire thingy) has middle pin connected to V+ (and pin1 of the chip) while the two other pins (quadrature outputs) go to chip which is obviously controller.
Google helped in finding datasheet for TP8472BP (pins 12,13 for one axis, 14,15 for second and 3,4 for wheel):
**broken link removed**