Nokia Siemens Networks Gmbh & Co Kg

Nancy Hecker

Erich Gottwald

Werner Paetsch

Wolfgang Schairer

Dirk Van Den Borne

Bernhard Spinnler

Stefano Calabro

Alexander Richter

Georg Sebald

Wolfgang Fischler

In order to reduce mutual interferences between POLMUX and signals, the signals are transmitted with differed to each other carrying signals, thereby making it possible to obtain the circular polarization of each resulting POLMUX signal. Each second POLMUX signal is transmissible with an opposite circular polarization. In order to reduce also interferences when only one modulated data signal is transmitted through a POLMUX channel, a polarization plane of modulated data signals of each second POLMUX channel is turned at 45&#xb0;. In a variant, polarization multiplex signals are produces and the resulting polarizations thereof in adjacent channels are perpendicular to each other.

Methods for the optical transmission of polarization multiplex signals

The polarization-multiplexed signal contains two data signals that are orthogonally polarized in relation to one another. Their carrier signals are derived from the same source and thus have the same wavelength. The phase difference between the carrier signals, is adjusted or regulated in such a way that it corresponds to 90&#xb0;. The phase difference of the carrier signals permits the susceptibility to polarization mode dispersion to be significantly reduced.

Method for optical transmission of a polarization division multiplexed signal

A cross connector for the transparent switching of optical signals is disclosed, comprising a first switching module with one or several switching modules of varying granularity, such as patch panel, wavelength groups or/and wavelengths. A second switching device is connected in series with the first switching device and comprises a polarization multiplex switching granularity.

Cross-connector for optical signals

Method for reducing signal degradation in an optical polarisation-multiplex system. The modulated optical signals to be transmitted are synchronised or generated such that the phase difference for NRZ-modulated signals is at least approximately 0&#xb0; and the phase difference for RZ-modulated signals is at least approximately 180&#xb0;. They can also be achieved by means of different synchronising devices.

Method and polarization-multiplex system for reducing the signal degradation of an optical polarization-multiplex signal

Binary signals are converted at the transmission end into two optical signals which are combined into a polarization multiplex signal and are then transmitted. The transmitted polarization multiplex signal is divided at the receiving end into two polarized signal parts which are converted in a linear manner into orthogonal electrical components and are supplied to a multidimensional filter. Said multidimensional filter replaces a polarization controller, restores the signal values that correspond to the signals at the transmission end, and compensates signal distortions.

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Munich, Germany

Nancy Hecker