Sohler, W.W.SohlerBuchter, D.D.BuchterGui, L.L.GuiHerrmann, H.H.HerrmannHu, H.H.HuLudwig, R.R.LudwigNouroozi, R.R.NourooziQuiring, V.V.QuiringRicken, R.R.RickenSchubert, C.C.SchubertSuche, H.H.Suche2022-03-112022-03-112009https://publica.fraunhofer.de/handle/publica/364668Recent progress of wavelength conversion and all-optical signal processing in periodically poled lithium niobate (PPLN) waveguides is reported. Applications for optical communications in the near-infrared, as well as for tuneable absorption spectroscopy in the mid-infrared are highlighted. Novel waveguide structures and fabrication methods are presented.eninfrared spectroscopyintegrated opticslithium compoundsoptical communication equipmentoptical fabricationoptical information processingoptical tuningoptical waveguidesoptical wavelength conversion621conference paper