160 Gbit/s OTDM Long-Haul Transmission with Long-Term Stability Using RZ-DPSK Modulation Format. - Sebastian Ferber; Carsten Schmidt-Langhorst; Reinhold Ludwig; Christof Boerner; Colja Schubert; Vincent Marembert; Marcel Kroh; Hans-Georg Weber (IEICE Trans. Commun., 2005)