Method and device for stabilizing the state of polarization...

Details Method and device for stabilizing the state of polarization... Method and device for stabilizing the state of polarization...

2011-03-29

2011-03-29

Tran, Dzung D (Department: 2613)

Optical communications

Multiplex

Polarization

C398S081000, C398S093000

Reexamination Certificate

active

07917031

ABSTRACT:
A device and method for stabilizing the polarization of polarization multiplexed optical radiation includes an identified channel which is provided with a pilot signal. The device and method are based on providing to the polarization multiplexed optical radiation a controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the polarization transformation; controlling, responsively to the optical power, the controllable polarization transformation so that the identified channel downstream the polarization transformation has a predefined polarization azimuth; providing to the optical radiation downstream the polarization transformation a further controllable polarization transformation; measuring the optical power of a polarized portion of the identified channel downstream the further controllable polarization transformation; and controlling, responsively to the optical power, the further controllable polarization transformation so that the identified channel downstream the further controllable polarization transformation has a predefined state of polarization.

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