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2011
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Amplifiers vs applications
Current usages:
EDFAs mature → all telecom applications
installed in ∼ all amplified networks
only C and L bands; require control → transients
Raman → long-range transmissions
deployed in recent systems
SOA → low cost
beginning to be used
Under development:
SOA → special functions (RSOAs; all-optical processing)
QD-SOA: very promising
catch up with EDFA when available in C band?
Research or non-telecom usages:
EYDFA (high power); Tm, Pr, Yb (λ < 1500 nm)
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