Hu, H.H.HuNouroozi, R.R.NourooziLudwig, R.R.LudwigSchmidt-Langhorst, C.C.Schmidt-LanghorstSuche, H.H.SucheSohler, W.W.SohlerSchubert, C.C.Schubert2022-03-042022-03-042011https://publica.fraunhofer.de/handle/publica/22516810.1109/LPT.2011.21194732-s2.0-79955506946Polarization-insensitive in-line all-optical wavelength conversion (AOWC) of a single-channel 320-Gb/s RZ-DQPSK data signal in the middle of a 320-km transmission span is reported. The technique is based on a Ti:PPLN waveguide in a polarization diversity scheme. The conversion efficiency of the signal was -21 dB, which includes 9.2 dB of passive losses in the whole Ti:PPLN subsystem. Error-free performance for the in-line wavelength converted signal after 320-km transmission was successfully achieved.en621535journal article