Aimone, A.A.AimoneLopez, I.G.I.G.LopezAlreesh, S.S.AlreeshRito, P.P.RitoBrast, T.T.BrastHöhns, V.V.HöhnsFiol, G.G.FiolGruner, M.M.GrunerFischer, J.K.J.K.FischerHonecker, J.J.HoneckerSteffan, A.G.A.G.SteffanKissinger, D.D.KissingerUlusoy, A.C.A.C.UlusoySchell, M.M.Schell2022-03-132022-03-132016https://publica.fraunhofer.de/handle/publica/39391510.1364/OFC.2016.Th5C.62-s2.0-84986222777We demonstrate for the first time 32 GBd 64-QAM signal generation without the usage of DACs. The dual-polarization 64-QAM signal is transmitted error-free over 80 km of SSMF with 7.8 pJ/bit record low energy consumption.en621conference paper