Optical branching waveguide

Details Optical branching waveguide Optical branching waveguide

G - Physics

02

B

G02B 27/10 (2006.01) G02B 6/12 (2006.01) G02B 6/125 (2006.01)

Patent

CA 2041460

An optical branching waveguide having low radiative loss and low back-reflectivity is described. By employing between the branches a region having a gradual decrease in effective refractive index along the direction of optical propagation, the deleterious effect of wedge tip truncation can be reduced. According to the teachings of the invention, this may be accomplished by gradually decreasing the thickness of the optical material along the axis of optical propagation and planarizing the region with an optical material having an lower refractive index than the underlying optical material.

Guide optique en Y à faible perte de rayonnement et faible réflectivité arrière. La présence, entre les embranchements, d'une région dont l'indice de réfraction effectif décroît graduellement dans le sens de la propagation optique permet de réduire l'effet néfaste de la taille de l'extrémité en biseau. L'invention montre que cela peut se faire en diminuant graduellement l'épaisseur du matériau optique suivant l'axe de propagation optique et en aplanissant la région au moyen d'un matériau optique dont l'indice de réfraction est inférieur à celui du matériau optique sous-jacent.

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