Richter, T.T.RichterSchmidt-Langhorst, C.C.Schmidt-LanghorstElschner, R.R.ElschnerKato, T.T.KatoTanimura, T.T.TanimuraWatanabe, S.S.WatanabeSchubert, C.C.Schubert2022-03-122022-03-122015https://publica.fraunhofer.de/handle/publica/38889910.1364/OFC.2015.W3C.3A concept for distributed ultra-dense frequency-division multiplexing is presented which enables precise frequency allocation without the need of absolute optical frequency control at the multiplexing nodes. We review experiments with OFDM and zero-guard-band Nyquist-WDM to demonstrate the precise generation of superchannels.enconference paper