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Updated: May 13, 2026
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE
Tatsunori Omiya1, Masato Yoshida, Masataka Nakazawa
1Research Institute of Electrical Communication, Tohoku University,2-1-1 Katahira, Sendai-shi, Miyagi-ken, 980-8577 Japan. t-omiya@riec.tohoku.ac.jp
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.
