Yeah that's exactly how higher power (compared to 40km SFP modules) communication lasers work and why nobody wears laser goggles in a data center. Automatically turning the laser off when the other side stops responding is ancient tech
Something like what? An eye?
Something that responds to a protocol handshake?
I think most high power optics do this already, right?
So a freemason
blinks in IEEE
It does that, if I understand what I read about it a year ago.