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2011
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EDFA characteristics
C- or L-band
All-fiber ⇒ low insertion loss
Gain up to 40 dB, P
out
> 23 dB
m
, polarization-independent
NF down to ∼ 3 dB (lab) ; 4–6 dB in practice
Long-lifetime excited states (few ms)
⇒ gain = constant over each bit
⇒ good linearity
Drawbacks:
Optical pumping ⇒ complex
Sensitive to traffic fluctuations (on packet networks)
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