title: 400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE.
abstract: We demonstrate 400 Gbit/s frequency-division-multiplexed and polarization-division-multiplexed 256 QAM-OFDM transmission over 720 km with a spectral efficiency of 14 bit/s/Hz by using high-resolution frequency domain equalization (FDE) and digital back-propagation (DBP) methods. A detailed analytical evaluation of the 256 QAM-OFDM transmission is also provided, which clarifies the influence of quantization error in the digital coherent receiver on the waveform distortion compensation with DBP.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University,2-1-1 Katahira, Sendai-shi, Miyagi-ken, 980-8577 Japan. t-omiya@riec.tohoku.ac.jp
authors.forename: Tatsunori
authors.initials: T
authors.lastname: Omiya
authors.forename: Masato
authors.initials: M
authors.lastname: Yoshida
authors.forename: Masataka
authors.initials: M
authors.lastname: Nakazawa
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D055096:Optical Devices; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*