Using light to communicate has a pretty long history, you just blink lights in a pattern, same as electric signals just without a wire, I mean you can use a "wire" to make light go further (optical fiber), you send zeros and ones by turning the laser on and off, that's all, optical audio connections came to the market in 1983, the undersea internet cable are optical etc, you can blink a flashlight in Morse code and it's a light based communication, swap flashlight with a laser and you have "an information in a laser beam", that's all, you want to send more info faster just blink faster