3760km, 100G SSMF transmission over commercial terrestrial DWDM ROADM systems using SD-FEC

We report error-free, 47×80km transmission of a real-time, 120Gbps, coherent PM-QPSK MSA transceiver with soft-decision forward-error-correction. Two cascaded commercial systems included 40G neighbors and ten ROADMs. The transceiver compensated 60,000ps/nm and had 2.5dB remaining margin.