Transmission of 42.7-Gb/s VSB-CSRZ over 1600 km and four OADM nodes with a spectral efficiency of 0.8-bit/s/Hz

We report the longest transmission of a binary-encoded signal at 0.8 bit/s/Hz information spectral efficiency with co-polarized channels and multiple optical add/drop multiplexers. The penalty after 1600-km transmission of 50-GHz spaced 42.7-Gb/s VSB-CSRZ channels and four OADMs is 3.6 dB.