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WDM upgrading of an installed submarine optical amplifier system

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5 Author(s)
Murakami, M. ; NTT Network Service Syst. Labs., Kanagawa, Japan ; Matsuda, T. ; Maeda, H. ; Tada, Y.
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This paper describes the WDM upgrading of a submarine optical amplifier system installed for single-channel transmission in commercial use. The key technologies used include 10-Gb/s high-speed forward error correction, preemphasis to overcome the optical passband-width constraint, optimized signal pulse format that leads to partial return-to-zero (PRZ) signaling, and dispersion compensation to suppress the degradation caused by fiber nonlinearity and dispersion. It also reports field experimental results on upgraded system performance. The results confirm that simply upgrading the terminal equipment allows the transmission capacity of a submersed line consisting of submarine repeaters and cables to be flexibly increased from 10 Gb/s to 40 Gb/s per fiber pair

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Lightwave Technology, Journal of  (Volume:19 ,  Issue: 11 )