When you write "modern" how long ago would that have been installed?
/me trying to get a handle on optical development.
/me trying to get a handle on optical development.
They're used in long haul communication for some 15 years or so. They're especially useful in submarine cables, for the sole reason, that new optical transmission schemes(modulation, wavelength multiplexing and so on) can be implemented by just replacing the equipment on either end, without the need to replace components down there on the seabed.