Optical communications – Multiplex – Polarization
Reexamination Certificate
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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Boffi Pierpaolo
Marazzi Lucia
Martelli Paolo
Martinelli Mario
Righetti Aldo
Finnegan Henderson Farabow Garrett & Dunner LLP
PGT Photonics S.p.A.
Tran Dzung D
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