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The sub-Nyquist time-frequency packing (TFP) technique was demonstrated in a superchannel field trial transmission over long-haul distances. The technique allows high spectral efficiency even with low-order modulation formats. The transmission was successfully performed on an installed link between Milan and Finkenstein (Austria) in a loop back configuration, which included 2 Â 660 km of ITU-T G.655 fiber. The superchannel is composed by eight subchannels with low-level modulation format, i.e.,doi:10.1109/jphot.2016.2539549 fatcat:5rmtvdofkzeo3iw5jziqwl5jme