0.8 Bit/s/Hz Spectral Efficiency at 10Gb/s via Vestigial-sideband Filtering

We demonstrate the first 10Gb/s DWDM transmission at 12.5GHz spacing without polarization division multiplexing or polarization interleaving. This dense channel spacing is accomplished via vestigial sideband filtering and 8x10Gb/s has been transmitted over 100km of SMF-28 without repeater.