Transmission of 32 × 40 Gbit/s ETDM channels has been demonstrated over straight-line 1000 km NDSF with 100 GHz channel spacing and a record 160 and 200 km amplifier spacing. Active Raman gain flattening allowed viable performance without forward error correction, optical regeneration and polarisation interleaving.
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Zhu et al. (2001) studied this question.
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