Transmission of 400G PM-16QAM channels over long-haul distance with commercial all-distributed Raman amplification system and aged standard SMF in field

Transmission of eight dual-carrier 400G PM-16QAM channels over 1,504-km aged SSMF in field is demonstrated with high-coding-gain FEC and commercial all-distributed-Raman amplification system. The result shows 16QAM can be used for deployed long-haul fiber networks.

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