Deutschetelekom Ag

Bernhard Hils

Wolfgang Dultz

Leonid Alexseevich Beresnev

Heidrun Schmitzer

Joachim Vobian

Leonid Beresnev

Rosemarie Hild

The present invention relates to a method and a device for forming the intensity profile of a laser beam, in particular for producing a homogeneous intensity profile. In an embodiment of the present invention, the laser beam can strike an optically addressable spatial light-modular (OASLM), whose local transmission or reflection properties depend in nonlinear fashion on the local illumination intensity.

Method and device for forming the intensity profile of a laser beam

A method and a device are described to compensate for polarization mode dispersion in an optical transmission link(,&prime;) having polarization-dependent transmission characteristics, in particular in optical fibers and cables with not only statistical, but preferred birefringence. A compensation element (,&Prime;), whose length is adjusted non-destructively using an interference device (,&Prime;), in particular a pressure mechanism, is connected upstream or downstream from the transmission link (,&prime;). The polarization states P,and P,of the compensation element are mixed by the interference and thus the length of the compensation fiber is defined at which a propagation time difference between the partial waves of polarization states P,and P,is increased or decreased so that it compensates for the propagation time difference &tgr; within the transmission link (,&prime;).

Method and device to compensate for polarization mode dispersion in an optical transmission link

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Königstein/Taunus, Germany

Bernhard Hils