Transmission of 2048SP-QAM Nyquist-WDM signals

In this contribution we experimentally investigate the performance of the four-dimensional 2048-ary set-partitioning quadrature amplitude modulation (4-D 2048SP-QAM) format in a Nyquist-WDM (NWDM) transmission system and compare it with PDM-64QAM at a symbol rate of 28 GBd in back-to-back and after transmission over standard singlemode fiber (SSMF). Three NWDM super-channels are generated, each formed by multiplexing five wavelengths with 35 GHz spacing. A gross bit rate of 1.54 Tb/s and 1.68 Tb/s per NWDM super-channel is obtained for 4-D 2048SPQAM and PDM-64QAM, respectively. Furthermore, the performance of the 2048SP-QAM format is evaluated in presence of soft-decision forward error correction (SD-FEC) based on turbo product code (TPC) with 21.3% overhead.