turboman

3 ms·

1. 1.▲
   by turboman 6y ago

   That's a bit of a stretch.
2. 2.▲
   by turboman 8y ago

   So to clear this up a bit. EDFAs (which are the in-line amplifiers which use erbium doping) work by having a section of a fiber doped with erbium ions. Only the part which is going to amplify the signal is doped, the rest of the fiber is su
3. 3.▲
   by turboman 8y ago

   3) is wrong. The amplifiers are powered by DC, but one side of the fiber provides positive voltage and the other negative - the ocean is not a part of the circuit.