title: Novel synchronous DPSK optical regenerator based on a feed-forward based carrier extraction scheme.
abstract: We experimentally demonstrate a novel synchronous 10.66 Gbit/s DPSK OEO regenerator which uses a feed-forward carrier extraction scheme with an injection-locked laser to synchronize the regenerated signal wavelength to the incoming signal wavelength. After injection-locking, a low-cost DFB laser used at the regenerator exhibited the same linewidth characteristics as the narrow line-width transmitter laser. The phase regeneration properties of the regenerator were evaluated by emulating random Gaussian phase noise applied to the DPSK signal before the regenerator using a phase modulator driven by an arbitrary waveform generator. The overall performance was evaluated in terms of electrical eye-diagrams, BER measurements, and constellation diagrams.
authors.affiliation: Photonic Systems Group, Department of Physics and Tyndall National Institute, University College Cork, Ireland. selwan.ibrahim@tyndall.ie
authors.forename: Selwan K
authors.initials: SK
authors.lastname: Ibrahim
authors.forename: Stylianos
authors.initials: S
authors.lastname: Sygletos
authors.forename: Danish
authors.initials: D
authors.lastname: Rafique
authors.forename: John A
authors.initials: JA
authors.lastname: O'Dowd
authors.forename: Ruwan
authors.initials: R
authors.lastname: Weerasuriya
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Ellis