Fischer, J.K.J.K.FischerMolle, L.L.MolleNölle, M.M.NölleGross, D.D.D.D.GrossSchmidt-Langhorst, C.C.Schmidt-LanghorstSchubert, C.C.Schubert2022-03-042022-03-042011https://publica.fraunhofer.de/handle/publica/22706210.1364/OE.19.00B667We experimentally investigate 28-GBd (84-Gb/s) and 37.3-GBd (112-Gb/s) polarization-switched quadrature phase-shift keying (PS-QPSK) signals. In single-channel transmission experiments over up to 12500 km ultra large effective area fiber, we compare their performance to that of polarization-division multiplexing quadrature phase-shift keying (PDM-QPSK) signals at the same bit rates. The experimental results show that PS-QPSK not only benefits from its better sensitivity but also offers an increased tolerance to intra-channel nonlinearities.en621journal article