0.8bit/s/Hz of Information Spectral Density by Vestigial Sideband Filtering of 42.66 Gb/s NRZ

Vestigial sideband filtering(VSB) technique is demonstrated at 42.66 Gbit/s NRZ data to achieve a high information density (ISD) of 0.8 bit/s/Hz with 50 GHz channel spacing without PDM (polarization division demultiplexing).