Optical circulator

G - Physics – 02 – B

Patent

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Details

G02B 5/30 (2006.01) G02B 6/00 (2006.01) G02B 6/26 (2006.01) G02F 1/09 (2006.01) G02F 1/31 (2006.01)

Patent

CA 2280845

An improved optical circulator transfers light from a first optical port to a second optical port, and from the second port to a third port. The circulator has reciprocal polarization rotators (16-A, -B; 18-A, -B) and non-reciprocal polarization rotators (20-A, -B), birefringent beam splitters and combiners (14-A, -B), and a birefringent walk-off element (26) as well as a polarization- dependent light bending device comprising two tapered birefringent plates (22, 24). The light bending device compensates for an angle between a first light beam emanating from the first port and a second light beam propagating to the third port. The existence of this angle allows the first and third fibers to be coupled to the light beams using a single lens.

Circulateur optique amélioré qui transfère la lumière d'une première voie optique vers une deuxième voie optique, et de la deuxième voie optique vers une troisième voie optique. Ledit circulateur possède des rotateurs (16-A, -B; 18-A, -B) de polarisation réciproque et des rotateurs (20-A, -B) de polarisation non réciproque, des diviseurs de faisceaux et des combinateurs (14-A, -B) biréfringents, et un élément de décrochage (26) biréfringent ainsi qu'un dispositif de coudage de la lumière dépendant de la polarisation comportant deux plaques (22, 24) biréfringentes effilées. Le dispositif de coudage de lumière compense un angle entre un premier faisceau de lumière émanant de la première voie et un deuxième faisceau de lumière se propageant vers la troisième voie. L'existence de cet angle permet le couplage des première et troisième fibres aux faisceaux lumineux à l'aide d'une seule lentille.

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