PT Unknown AU Leuthold, J Freude, W Koos, C Schmogrow, R Hillerkuss, D TI OFDM and Nyquist Multiplexing: Tbit/s Capacities and Spectral Efficiencies up to 18 bit/s/Hz SE Advanced Photonics Congress, Signal Processing in Photonic Communications (SPPCom), Colorado Springs, June 19-21 PY 2012 BP SpTu1A.4 DI 10.1364/sppcom.2012.sptu1a.4 LA english PI Colorado Springs, CO, USA ER