X. Liu, S. Chandrasekhar, A. Gnauck, P. Winzer, S. Randel, S. Corteselli, B. Zhu, T. Taunay, M. Fishteyn
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Digital coherent superposition for performance improvement of spatially multiplexed 676-Gb/s OFDM-16QAM superchannels
We demonstrate the use of digital coherent superposition to improve the performance of space-division-multiplexed (SDM) 676-Gb/s OFDM-16QAM superchannels, achieving ~4 dB improvement in OSNR by using two SDM copies and 1075-km (14×76.8km) transmission over a seven-core-fiber with an effective aggregate spectral efficiency of 23.7 b/s/Hz.