Xieon Networks S.a.r.l.

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Alessandro Bianciotto

Bernhard Spinnler

Antonio Napoli

Christina Hebebrand

Maxim Kuschnerov

Mahdi Mezghanni

Stefano Calabro

Stefano Calabró

Juraj Slovak

Dirk Van Den Borne

Dirk-Daniel Gross

Disclosed herein is a dual parallel Mach-Zehnder-modulator (DPMZM) device comprising a DPMZMhaving first and second inner MZMs arranged parallel to each other. The first inner MZM generates an in-phase component Eof an optical signal in response to a first driving voltage V, and the second inner MZM generates a quadrature component Eof said optical signal in response to a second driving voltage V. Further disclosed is a calculation unitconfigured for receiving an in-phase component yand a quadrature component yof a desired base-band signal, and for calculating pre-distorted first and second driving voltages V, V. The calculation of the pre-distorted first and second driving voltages V, Vis based on a model of said DPMZMaccounting for I-Q cross-talk, and using an algorithm that determines said first and second driving voltages V, Veach as a function of both of said in-phase and quadrature components y, yof said base-band signal.

Dual parallel Mach-Zehnder-modulator device with pre-distorted driving voltages

Component signal values are derived from component signals and fed to at least one fixed equalizer which generates equalizer output signals. The signals are fed to phase error detectors generating phase error signals. The phase error signals are combined with further phase error signals derived by further error detectors receiving signal values from further equalizers and/or the component signal values directly from sample units.

Clock recovery method and clock recovery arrangement for coherent polarization multiplex receivers

A method for an optical communication system and an optical communication system comprising a pump source configured to generate a pump signal having rotating polarization, a polarization sensitive receiver for receiving the optical signal having a polarization tracking cut-off frequency, wherein the polarization of the pump signal is configured to rotate at a predetermined frequency of polarization rotation and the frequency of polarization rotation of the pump signal is higher than the polarization tracking cut-off frequency of the receiver. Suitable for mitigation of cross-polarization modulation (XPolM) related effects in coherent polarization multiplexed quadrature phase shift keying (CP-QPSK) systems.

Optical communication system and method

Growing community of inventors

Munich, Germany

Alessandro Bianciotto