Wang, J.J.WangMaitra, A.A.MaitraFreude, W.W.FreudeLeuthold, J.J.Leuthold2022-03-042022-03-042009https://publica.fraunhofer.de/handle/publica/22087310.1364/OE.17.0226392-s2.0-72049128089We discuss an all-optical DPSK wavelength conversion scheme comprising a delay-interferometer demodulation stage followed by a Mach-Zehnder interferometer, the arms of which are formed by nonlinear wave-guides. If operated properly, the configuration shows regenerative beha-viour. This is true for nonlinear waveguides with a dominant cross-gain nonlinearity (e. g., for an electro-absorption amplitude modulator) as well as for the case of a dominant cross-phase nonlinearity (e. g., for Kerr effect based phase modulator). In addition, we show that nonlinear materials exhi-biting cross-gain modulation properties can provide a binary phase response so far only known from the transfer functions of digital electronics.en621journal article