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2011
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SOAs: comeback
Currently, SOAs making a comeback:
Long-distance transmissions changing techniques
Constant-envelope modulations (NRZ-xPSK)
Packet networks ⇒ transients on packet timescales
Development of novel metro+access networks
Low cost preferred
Coarse WDM ⇒ less FWM, need wide bandwidth
Shorter distances/lower powers ⇒ small signals ⇒ SOAs ∼ linear
“Extender-boxes” → long-range access networks (> 20 km)
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