Back 25 years ago I worked for the phone company. I was excited to learn that the way fiber works is essentially to carry multiple channels based on divisions o

Back 25 years ago I worked for the phone company. I was excited to learn that the way fiber works is essentially to carry multiple channels based on divisions of color. Of course, when you stop to think about it, that's precisely analogous to carrying multiple frequencies of radio, or audio (as with a modem). But thinking of this in terms of multiple colors being transmitted simultaneously really brought the point home.