Mbps/Gbps/Tbps is the bandwidth speed, instead of the physical speed of electromagnetic wave. You can always make more fibers and codecs and have them in parall

Mbps/Gbps/Tbps is the bandwidth speed, instead of the physical speed of electromagnetic wave. You can always make more fibers and codecs and have them in parallel to get a greater bandwidth speed, which has no maximum limit. It all depends on how fast we need and how economically effective it is.