Methods and apparatus for polarization control

G - Physics – 02 – B

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G02B 26/00 (2006.01) G02F 1/01 (2006.01) H04B 10/02 (2006.01)

Patent

CA 2500685

Methods and apparatus of performing polarization control for optical transmissions are provided. The methods and apparatus enable polarization control devices to achieve a desired output state of polarization regardless of the input state of polarization. The desires state of polarization can be achieved by rotating waveplates in a polarization controller in a sequential fashion. Each waveplate may be continually adjusted or dithered so long as the feedback signal satisfies a feedback condition. Once the feedback signal exceeds the feedback condition, the next waveplate in the polarization controller is adjusted. This enables the methods and apparatus to rapidly adjust the state of polarization away from dead spots and minimize loss control problems.

Appareil et méthodes de commande de polarisation pour des transmissions optiques. Cet appareil et les méthodes en question permettent à des dispositifs de commande de polarisation d'obtenir l'état de sortie de polarisation souhaité quel que soit l'état d'entrée de polarisation. L'état de polarisation souhaité peut être obtenu par la rotation des lames à retard d'un contrôleur de polarisation d'une manière séquentielle. Chaque lame de retard peut être ajustée ou tramée constamment tant que le signal de rétroaction est conforme à une prémisse de rétroaction. Lorsque ce signal dépasse ladite prémisse, la lame de retard suivant du contrôleur de polarisation est ajustée, ce qui permet à l'appareil et aux méthodes d'ajuster rapidement l'état de polarisation hors des points ternes et minimise les problèmes de perte de contrôle.

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