Siemens Aktiengesellschaft

Georg Mohs

Christoph Glingener

Christian Scheerer

Cornelius Fuerst

Harald Geiger

Erich Gottwald

Andreas Faerbert

Werner Rosenkranz

Marc Bohn

Sven Otte

Jan Mietzner

In the high-bit-rate transmission of optical signals in an optical transmission system having N optical fiber link sections with, in each case, one optical fiber and one dispersion compensation unit, the absolute-magnitude compensations of the first to Nth dispersion compensation units are dimensioned in such a way that the first to N&#x2212;1-th fiber link sections is/are overcompensated, in each case, by approximately the same absolute magnitude overcompensation. Furthermore, the absolute-magnitude compensation of the Nth dispersion compensation unit is dimensioned in such a way that the accumulated fiber dispersion at the output of the optical transmission system is virtually completely compensated.

Optical transmission system for high-bit-rate transmission of optical signals with the aid of dispersion compensation units

A compensation system for adaptive equalization of an optical signal, wherein an optical filter, whose complex coefficients are adjustable, is used for signal equalization. The quality of the optical signal is used, after conversion to an electrical data signal, as a control criterion. The compensation device can largely compensate for distortion produced by dispersion, polarization mode dispersion or self phase modulation. An optical compensation filter with a wide free spectral range is used to compensate for the wavelength-dependent dispersion in a wavelength-division multiplexed system. The setting of the filter may be fixed, or may be adjusted adaptively in a closed control loop.

Compensation system for adaptive equalization of an optical signal

A method and drive unit for controlling a modulator ( ) in which the working point of the modulator ( ) is regulated using a regulating circuit ( ) in such a way that the working point is stable in relation to the transmission characteristic curve of the modulator ( ) for a long time and under different operating conditions.

Method for regulating the working point of a modulator and associated drive unit

Method for controlling the operating range of a modulator, and an associated drive unit, the operating range of the modulator being controlled via a control circuit such that the operating range is stable over a long period of time and in different operating conditions, relative to the transmission characteristic of the modulator.

Method for controlling the operating range of a modulator, and an associated drive unit

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Essen, Germany

Georg Mohs