Fabrication of collimators employing optical fibers...

G - Physics – 02 – B

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G02B 6/26 (2006.01) G02B 6/255 (2006.01) G02B 6/32 (2006.01)

Patent

CA 2361639

A fiber collimator (110, 210) is provided, comprising at least two optical components, one of the optical components (e.g., an optical element such as a collimating lens or a plano-plano pellet) (14) having a surface (14a) that has a comparatively larger cross-sectional area than the surface of the other optical component(s) (e.g., at least one optical fiber) (12). The optical components (12, 14) are joined together by fusion-splicing, using a laser. A gradient (28 or 28') in the index of refraction is provided in at least that portion of the surface (14a) of the optical element (14) to which the optical fiber(s) (12) is fusion-spliced or at the tip of the optical fiber. The gradient (28 or 28') is either formed prior to or during the fusion-splicing. Back-reflection is minimized, pointing accuracy is improved, and power handling ability is increased.

La présente invention concerne un collimateur à fibres (110, 210) comprenant au moins deux composants optiques, l'un de ces composants (par exemple, un élément optique tel qu'une lentille collimatrice ou une pastille plane-plane) (14) possédant une surface (14a) de section transversale plus grande que celle de la surface de l'autre composant optique (par exemple, au moins une fibre optique) (12). Les composants optiques (12, 14) sont joints par fusion-épissure, au moyen d'un laser. L'élément optique (14) comporte un gradient (28 ou 28') d'indice de réfraction au moins dans la portion de surface (14a) sur laquelle la ou les fibres optiques (12) sont jointes par fusion-épissure ou bien à l'extrémité de la fibre optique. Ce gradient (28 ou 28') est formé avant ou lors de la fusion-épissure. Il en résulte une diminution de la rétroréflexion ainsi qu'une augmentation de la précision de pointage et de la puissance admissible.

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