Very little over 10G exists on any single wavelength, its all in stacking at different wavelengths. Much as your cabletv has a zillion 6MHz wide channels holdi

Very little over 10G exists on any single wavelength, its all in stacking at different wavelengths. Much as your cabletv has a zillion 6MHz wide channels holding HDTV or whatever, you can run 4, 10, whatever, 10G ethernet light wavelengths on a piece of fiber at slightly different colors. https://en.wikipedia.org/wiki/Wavelength-division_multiplexing https://en.wikipedia.org/wiki/Wavelength-division_multiplexi... https://en.wikipedia.org/wiki/Synchronous_optical_networking https://en.wikipedia.org/wiki/Synchronous_optical_networking https://en.wikipedia.org/wiki/100_Gigabit_Ethernet https://en.wikipedia.org/wiki/100_Gigabit_Ethernet Note the difference between latency and bandwidth... infiniband isn't really all that fast, but it is very low latency. Infiniband-FDR "fourteen data rate" is technically over your speed criteria. https://en.wikipedia.org/wiki/InfiniBand https://en.wikipedia.org/wiki/InfiniBand You start having problems with infinitely narrow pulses because glass isn't linear enough and lasers aren't monochromatic enough, and multipath etc.