Cvecek, K.K.CvecekSponsel, K.K.SponselStephan, C.C.StephanOnishchukov, G.G.OnishchukovLudwig, R.R.LudwigSchubert, C.C.SchubertSchmauss, B.B.SchmaussLeuchs, G.G.Leuchs2022-03-042022-03-042008https://publica.fraunhofer.de/handle/publica/21542710.1364/OE.16.001923We propose a modified nonlinear amplifying loop mirror (NALM) for phase-preserving 2R regeneration of wavelength division multiplexed (WDM) return-to-zero differential phase-shift-keyed signals. As proof of principle the regeneration capability of this NALM setup has been investigated experimentally for two 10 Gbit/s wavelength channels. A significant eye-opening improvement and a negative power penalty of 1.2 dB have been observed in both channels.en621journal article