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Highly spectral-efficient 21.4 Gbit/s-based WDM signal has been transmitted over transPacific distances, for the first time, using VSB-RZ format, Raman/EDFA hybrid repeaters and symmetrically dispersion-managed fibre. The achieved spectral efficiency was 50%
Recent advances in transoceanic transmission technologies are reviewed. After a brief description of the 10 Gbit/s-based terabit submarine systems at the commercially deployable stage, recent studies on multi-terabit systems and 20/40 Gbit/s-based WDM systems are discussed
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