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2011
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Erbium-doped fiber amplifiers
Currently most-used amplifiers: EDFAs
Er
3+
ions in silica (glass) fiber (codoped Al
2
O
3
, GeO
2
, P
2
O
5
...
possibly TeO
2
ou ZBLAN/fluoride → stronger doping)
Optical pumping: 980 nm, used to be 1480 nm, more efficient before
good 980-nm lasers
Amplification in C-band (1530-1565 nm) or L-band (1565-1600 nm)
Setup:
Pump
980 nm
Counterpropagating
pump
Copropagating
pump
Signal
IsolatorEr
3+
-doped fiber
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