Lucent Technologies Inc.

Matthias Berger

Herbert Haunstein

Paul S Westbrook

Benjamin John Eggleton

Lothar Benedikt Moeller

Dieter Werner

Konrad Sticht

Claus Dorschky

Bernhard Schmauss

Christoph Schulien

Frank Kunz

Andreas Munk

Alfons Schinabeck

In accordance with the invention, an optical fiber communication system is provided with a tunable linearly chirped Bragg grating in high birefringence fiber for reduction of polarization mode dispersion without increasing chromatic dispersion. A first embodiment using a single grating can be tuned for optimal PMD compensation, optimal chromatic compensation or optimal simultaneous compensation. Alternative embodiments using a plurality of gratings permit simultaneous compensation of both PMD and chromatic dispersion.

Optical fiber communication systems having simultaneous compensation of polarization mode dispersion and chromatic dispersion

A method for correcting the phase of a clock in a data receiver which receives a data flow representing different signal levels with logical high and low signal values and signal transitions positioned therebetween, wherein the positions of such signal transitions between respective two adjacent logical signal values are evaluated for correcting the phase of the clock. The position of a signal transition between a first pair of signal values on one level () or a second pair of signal values on the other level () is weighted stronger in the evaluation then the positions of signal transitions between adjacent single signal values () of different signal levels.

Method and apparatus for correcting the phase of a clock in a data receiver

The invention relates to a method and a device for wavelength stabilizing for multichannel optical transmission systems. An optical multiplexer is used directly for the generation of the optical total signal. This makes possible a simple electronic regulation of wavelengths of the optical carrier signals through analysis of the amplitude values of low-frequency signals, which modulate the optical carrier signals by means of amplitude modulation.

Method and arrangement for stabilizing wavelength of multi-channel optical transmission systems

The invention relates to a method and an optical transmission system for compensation of dispersion in optical transmission lines in which dispersion compensation fibers are applied, with the dispersion compensation fibers being arranged at the beginning as well as at the end of the line segments of the optical fibers forming the transmission line. The signal distortions due to non-linear effects are reduced by making use of the recognition that non-linearities should only occur at as small as possible an accumulated dispersion. This is obtained by an unequal division of the dispersion compensation fiber applied for the compensation of the dispersion of the optical fiber, with the part of the dispersion compensation fiber attached at the beginning of a line segment being directly connected to the optical fiber and having an accumulated dispersion which is smaller as to amount than the accumulated dispersion of the part of the dispersion compensation fiber attached at the end of the optical fiber.

Method and optical transmission system for compensating dispersion in

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Burgthann, Germany

Matthias Berger