Horikoshi Kengo

TL;DR: In this paper, the authors demonstrate the record total capacity of 69.1 Tb/s with a spectral efficiency of 6.4 b/s/Hz by employing 21.4-Gbaud 16-QAM modulation, blind digital coherent detection, and 10.8-THz ultra-wideband amplification in the C- and extended L-bands.

TL;DR: In this paper, the authors describe ultra-high capacity transmission based on spectrally efficient multi-level modulation and wideband optical amplification techniques and demonstrate 69.1 Tb/s transmission over 240 km of low loss pure silica core fibers.

TL;DR: In this paper, a linear adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains, and an adaptive equalization filter control block which updates a tap coefficient of an adaptive filter in accordance with an LMS algorithm using the difference between a target signal that is an output signal of the feedback distortion adding filter and the digital signal as an error signal.

TL;DR: In this paper, the authors demonstrate the record total capacity of 69.1 Tb/s with a spectral efficiency of 6.4 b/s/Hz by employing 21.4-Gbaud 16-QAM modulation, blind digital coherent detection, and 10.8-THz ultra-wideband amplification in the C- and extended L-bands.

TL;DR: A simple nonlinear digital pre-distortion (DPD) of optical transmitter components, which consists of concatenated blocks of a finite impulse response (FIR) filter, a memoryless nonlinear function and another FIR filter, is presented.