Xieon Networks S.a.r.l.

Nokia Siemens Networks Oy

Nokia Siemens Networks Gmbh & Co Kg

Xeion Networks S.a.r.l.

Bernhard Spinnler

Stefano Calabro

Maxim Kuschnerov

Antonio Napoli

Berthold Lankl

Alessandro Bianciotto

Christina Hebebrand

Fabian N Hauske

Norbert Hanik

Oscar Gaete

Leonardo Coelho

Ernst-Dieter Schmidt

Kittipong Piyawanno

Mahdi Mezghanni

Erich Gottwald

Lutz Rapp

Danish Rafique

Nancy Hecker

Werner Rosenkranz

Stefano Calabró

Stefano Calabrò

Chien-Yu Lin

Vincentius Antonius Johannes Mar Sleiffer

Heinrich Von Kirchbauer

Peter Kainzmaier

Oscar Cristobal Gaete Jamett

Stephan Witte

Christian Alexander Bunge

Miguel Drummond

Matthias Schuster

Georg Sebald

Disclosed herein is a transponder comprising a transmitter and a receiver. The transponder further comprises a receiver input amplifier, a bypass line, and a control unit configured for determining the performance of the transponder in relation to an OSNR related parameter, by controlling the transponder to generate a noise signal to be received by the receiver. The receiver input amplifier is operated to thereby cause ASE in the receiver input amplifier to facilitate the determination. A test signal is generated at the transmitter Said noise signal and said test signal, and/or one or more respective replicas thereof, are superimposed to form a combined signal to be received by said receiver to further facilitate determination of said performance related parameter based on said combined signal, wherein for generating said combined signal, said test signal is fed from the transmitter to the receiver by means of said bypass line.

Automatic measurement of the noise performance of a transponder

Disclosed is a receiver for receiving an optical signal comprising a plurality of carriers within a predetermined frequency band. The receiver comprises means for sampling and converting each of the carriers into a set of corresponding digital signals, and a digital processing unit for processing said digital signals of said set of digital signals such as to mitigate transmission impairments of the corresponding optical carriers based on corresponding processing parameters. The digital processing unit is configured for determining such processing parameters by carrying out a corresponding parameter derivation procedure based on one of the digital signals of said set of digital signals. The processing unit is configured for sharing thus determined processing parameters for processing of other digital signals among said set of digital signals based on said shared determined processing parameters, or processing parameters derived from said shared determined processing parameters.

Processing parameter and resource sharing architecture for superchannel based transmission systems

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

A method and device is provided for reducing optical transmission impairments, particularly nonlinear effects, of at least one link Said method comprising the following steps: extracting a phase information (&#x394;&#x3b8;) from an optical signal () received via that at least one link, determining a nonlinear coefficient (&#x3b3;), associated with the at least one link, based on the phase information (&#x394;&#x3b8;), applying a control mechanism () using the nonlinear coefficient (&#x3b3;). Furthermore, a communication system is suggested comprising said device.

Method, device and communication system for reducing optical transmission impairments

The present invention relates to signal processing in an optical receiver, in particular to equalization performed in coherent optical receivers. A multiple-input multiple-output (MIMO) equalizer receives and equalizes a plurality of real value signals, for example four sampled electrical baseband tributaries (HI, HQ, VI, VQ). The outputs of the multiple-input multiple-output (MIMO) equalizer provide equalized real or imaginary components of complex signals. The complex signals including the real and imaginary components are then each and individually equalized to remove chromatic dispersion.

Signal processing in an optical receiver

An encoder encodes digital data, said encoder includes one or more component encoders, one or more interconnections between component encoders, one or more inputs and one or more outputs. The encoder is configured to carry out the following steps: combining internal input bits received via an interconnection and external input bits received via a corresponding input, to assemble a local information word, encoding the local information word such as to generate a local code word, outputting a reduced local code word and handling the same reduced local code word over to the interconnect for forwarding the same reduced local code word to another component encoder or to itself, wherein the encoder is configured to forward on each interconnect the bits of the reduced local code in parallel but with delays that are mutually different for at least a subset of the reduced local code word bits.

Encoder, decoder and encoding method with low error floor

The present invention relates to performing chromatic dispersion estimation in a receiver of an optical communication system. Here, the signal received by the receiver includes frames, each comprising a training portion and a data portion. The training portion comprises a plurality of identical pattern sequences. Different settings are applied to an equalizer to generate a plurality of equalized signals from at least one of the received frames. Then, at least one correlation value is calculated between a first pattern sequence and a second pattern sequence of the equalized signals and a final correlation value is derived from the respective correlation values. The setting of the equalizer corresponding to the equalized signal providing the highest final correlation value is selected to provide the chromatic dispersion estimation.

Data-aided chromatic dispersion estimation

Disclosed herein is a modulator () for polarization-division multiplexing (PDM) transmission. The modulator () comprises first and second DP-MZMs () associated with first and second polarizations, each DP-MZM () having an input for an in-phase and a quadrature driving signal for modulating the in-phase and quadrature components of an optical signal according to respective transfer functions, and a detector () suitable for detecting light comprising at least a portion of the light outputted by the first DP-MZM () and a portion of the light outputted by the second DP-MZM (). The modulator () is adapted to superimpose a first pilot signal on one of the in-phase and quadrature driving signals of the first DP-MZM () and on one of the in-phase and quadrature driving signals of the second DP-MZM (), and a second pilot signal on the respective other of the in-phase and quadrature driving signals of the first and second DP-MZMs (). Further, the first and second pilot signals are chosen such that the signal detected by said detector () is indicative as to whether the slopes of the transfer functions are different for the in-phase and quadrature components of one of the first and second DP-MZMs () and identical for the other of the first and second DP-MZMs ().

Spectral inversion detection for polarization-division multiplexed optical transmission

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

The invention describes a method and an arrangement for transmitting an optical transmission signal with reduced polarization-dependent loss. A first transmission signal component and a second orthogonal transmission signal component of the optical transmission signal are transmitted with a time difference between said transmission signal components.

Method and arrangement for transmitting an optical transmission signal with reduced polarisation-dependent loss

A received POLMUX signal is rotated by fixed rotation parameters (Rot, Rot, Rot) and the rotated POLMUX signal with optimal signal performance is selected and phase information is derived from both polarities. A pre-filter improves the timing accuracy.

Symbol timing estimation for coherent polarization multiplex optical receivers

A method for phase recovery in a system that includes a clock recovery unit and an estimation unit. The clock recovery unit of the system has a first phase detector unit. The estimation unit has a second phase detector unit and it is configured to estimate a gain of the second phase detector unit. The estimation unit and the clock recovery unit are configured to operate in parallel.

Method and system for clock recovery with adaptive loop gain control

A method for processing data in an optical network element is provided, wherein a multicarrier signal is linear pre-coded, and wherein the linear pre-coded signal is modulated. An according optical network element is also suggested.

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Oberhaching, Germany

Bernhard Spinnler