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 without repeaters.