As the other comments stated, it can be as simple as turning the light on and off and we already do this with fiber optic network connections. The light particles themselves aren’t carrying the data, just the pattern of on and off.
It is also possible to send multiple streams of light using color filters. It’s called Wavelength Division Multiplexing.
You have my vote already!
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I always had pretty perky nipples. When I got them pierced, they became dangerous! I was always weirdly self conscious of my pokies as a man and began wearing undershirts as padding to make it less noticeable. If it bothers you, wear something a bit thicker, maybe hangs a bit looser on your shoulders.
Or, embrace 'em and #FreeTheNipple. Everyone has a pair (more or less). Just roll with it.
Generally, PCIe auto negotiates transfer speeds and lanes. Similar to a USB drive. It will probably work, but will be limited to the lowest common transfer speed.