High Spectral-Efficiency Transmission Techniques for Systems Beyond 100 Gb/s

Abstract
We review recent progress on high spectral-efficiency optical transmission with per-channel data rates beyond 100 Gb/s. Enabling technologies such as high-level QAM modulation, multiband superchannel transmission based on orthogonal frequency-division-multiplexing, and Nyquist wavelength-division-multiplexing are discussed.