NANOG has some good presentations on optical. "Everything You Always Wanted to Know About Optical": * https://www.youtube.com/watch?v=nKeZaNwPKPo https://www.y

NANOG has some good presentations on optical. "Everything You Always Wanted to Know About Optical": * https://www.youtube.com/watch?v=nKeZaNwPKPo https://www.youtube.com/watch?v=nKeZaNwPKPo Also "Demystifying Submarine Cables": * https://www.youtube.com/watch?v=Pk1e2YLf5Uc https://www.youtube.com/watch?v=Pk1e2YLf5Uc "Tutorial DWDM & Packet Optical Fundamentals Troubleshooting the Transmission Layer: * https://www.youtube.com/watch?v=dum8UXtbN3o https://www.youtube.com/watch?v=dum8UXtbN3o APNIC has "DWDM & Packet Optical Fundamentals: How to troubleshoot the Transmission Layer": * https://www.youtube.com/watch?v=hOgTU80YTDI https://www.youtube.com/watch?v=hOgTU80YTDI For long distance (>100km) transmission, searching for the keywords "coherent optics" is useful.