Nölle, M.M.NölleFischer, J.K.J.K.FischerMolle, L.L.MolleSchmidt-Langhorst, C.C.Schmidt-LanghorstSchubert, C.C.Schubert2022-03-122022-03-122012https://publica.fraunhofer.de/handle/publica/377861We experimentally investigate 112-Gb/s polarization-switched quadrature phase-shift keying signals. In ultra long-haul wavelength-division multiplexing (WDM) transmission experiments, we compare the performance of WDM channels with 1.07xsymbol rate spacing and a regular 50-GHz spacing.en621conference paper