Apparatus and method employing fast polarization modulation...

H - Electricity – 04 – B

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H04B 10/18 (2006.01) G02F 1/01 (2006.01) H04B 10/135 (2006.01) G02F 1/035 (2006.01)

Patent

CA 2121738

The effects of polarization dependent hole burning and/or polarization dependent loss are reduced by modulating the state of polarization (SOP) of an optical signal being launched into the transmission path periodically between first and second states of polarization of at least one pair of orthogonal states of polarization. Ideally, the launched modulated signal should spend equal time intervals in both states of the orthogonal pair. In one exemplary embodiment, the SOP is modulated such that it moves along a great circle on the Poincare' sphere. In another exemplary embodiment, the SOP is modulated such that it traces a complete great circle on the Poincare' sphere. In a preferred embodiment, a complete great circle is traced at a uniform speed on the Poincare' sphere.

Les effets de saturation sélective et d'affaiblissement dus à la polarisation sont réduits par modulation de l'état de polarisation (SOP) d'un signal optique injecté dans le trajet de transmission périodiquement entre le premier et le deuxième états de polarisation d'au moins une paire d'états de polarisation orthogonaux. Idéalement, le signal modulé injecté devrait demeurer pendant des intervalles de temps égaux dans les deux états de la paire orthogonale. Dans une version par exemple, le SOP est modulé de façon qu'il décrive un grand cercle sur la sphère de Poincaré. Dans une autre version, il est modulé de façon qu'il trace un grand cercle complet sur la sphère de Poincaré. Dans une version préférée, un grand cercle complet est tracé à une vitesse uniforme sur la sphère de Poincaré.

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