Planar optical waveguides with double grooves

G - Physics – 02 – B

Patent

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Details

G02B 6/12 (2006.01) C03C 15/00 (2006.01) G02B 6/125 (2006.01) G02B 6/13 (2006.01) G02B 6/132 (2006.01) G02B 6/136 (2006.01) G02B 6/34 (2006.01) G02F 1/225 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2372581

A planar optical waveguiding device (e.g. a device implemented in silica glass) includes at least one section of core (10) which is located between and adjacent to two grooves (11, 12). The refractive index within the grooves (11, 12) is substantially equal to one and the grooves (11, 12) are located so that the evanescent fields of optical signals travelling in the core (10) extend into the grooves (11, 12). Preferably the grooves (11, 12) have a direct interface with the core (10) and they extend through a layer (21) located above the core (10) into a layer (22) located below the core (10). Where the cores (10) have bends, e.g. bends with radii of curvature below 2 mm (and especially bow 500 µm) the grooves (11, 12) are located both inside and outside the bends.

L'invention concerne un dispositif guide d'onde optique planaire (un dispositif réalisé dans un verre de silice, par exemple), qui comprend au moins une section de noyau (10) située entre et à proximité de deux rainures (11, 12). L'indice de réfraction dans les rainures (11, 12) est sensiblement égal à un et les rainures (11, 12) sont disposées de telle sorte que les champs évanescents des signaux optiques parcourant le noyau (10) s'étendent à l'intérieur des rainures (11, 12). De préférence, les rainures (11, 12) font directement interface avec le noyau (10) et s'étendent à travers une couche (21) située au-dessus du noyau (10) pour pénétrer dans une couche (22) située au-dessous du noyau (10). Dans le cas où les noyaux (10) comportent des coudes, c'est-à-dire des coudes présentant des rayons de courbure inférieurs à 2 mm (notamment inférieurs à 500 mu m), les rainures (11, 12) se situent tant à l'intérieur qu'à l'extérieur des courbes.

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