In more technical terms, Bell used amplitude modulation of audio using light as the carrier wave, and selenium as a photoconductive transducer. Correct me if I'm mistaken...
As a kid I had this idea of using mirrors for wireless communication. I've never heard of this one before but it makes me very happy! I was thinking of using it for like, torrents or something though.
IIRC, Bell ended up wanting to spend his life after inventing the telephone as a scientist and a researcher, rather than tending to the running of Bell Telephone and AT&T.
https://www.youtube.com/watch?v=gJDNCxMfbLQ