Richard Steenbergen regularly gave/gives a presentation called "Everything You Always Wanted to Know About Optical" at NANOG: * https://www.youtube.com/watch?v

Richard Steenbergen regularly gave/gives a presentation called "Everything You Always Wanted to Know About Optical" at NANOG: * https://www.youtube.com/watch?v=nKeZaNwPKPo https://www.youtube.com/watch?v=nKeZaNwPKPo This is fibre optics in general. For long distance stuff (>40km) you want to do a search for "coherent optics". A lot of these long distance fibres have multiple signals going down one glass using different colours ("lambdas") which are (de)muxed; see Dense Wave Division Multiplexing: * https://www.youtube.com/watch?v=dum8UXtbN3o https://www.youtube.com/watch?v=dum8UXtbN3o