Patent ID: 6735351
Filing Date: 2004-05-11
Classification: H04B

Abstract:
A device for adjusting the polarization of an incoming optical signal to a defined polarization state using modulated-up data, with a polarization divider, which processes the incoming optical signal such that two optical signals with orthogonal polarization states are present at its output, with a series-connected first phase setter in the signal path of at least one of the two output signals from the polarization divider, with a first optical coupler, which distributes the light of the two output signals respectively in roughly equal parts to two outputs, with a second phase setter in the signal path of at least one of the two output signals from the first optical coupler, and with a series-connected second optical coupler, an actuating signal being supplied to the first and second phase setter respectively in a feedback loop, said actuating signal being obtained from a quality signal derived from the processed optical signal, wherein a first subtraction element is provided, to which the two parallel optical signals are supplied from a point of their signal paths after the first optical coupler, a bipolar quality signal being obtained in the first subtraction element from the difference of the two signals supplied, and that a first control element is connected downstream of the first subtraction element, which control element generates an actuating signal to one of the phase setters that adjusts the phase setter such that the amount of the quality signal is minimized and in particular adjusted to zero.