We achieve 63.5 Tb/s transmission over 5,380 km and 61.9 Tb/s over 5,920 km using 64QAM based coded modulation and continuous 73 nm optical bandwidth. 7.1 b/s/Hz spectral efficiency is achieved with 2.2 dBQ error correction threshold.
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Cai et al. (2015) studied this question.
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