Laser direct writing of planar lightwave circuits

Details Laser direct writing of planar lightwave circuits Laser direct writing of planar lightwave circuits

G - Physics

02

B

G02B 6/13 (2006.01)

Patent

CA 2336091

A laser beam with an annular or ring shaped intensity distribution, such as a TEM01* beam, is scanned across the surface of a photosensitive thin film to directly produce changes of refractive index in selected regions of the film. This method is suitable for producing channel waveguides for planar lightwave circuits, where the refractive index profile (solid curve) of such a waveguide is more uniform than the prior art refractive index profile (dashed curve) produced by a TEM00 laser beam, and has a reduced bend loss.

L'invention concerne un faisceau laser présentant une répartition d'intensité en forme annulaire telle qu'un faisceau TEM¿01?*, qui est balayé à travers la surface d'un film mince photosensible pour produire directement des variations d'indices de réfraction dans des zones sélectionnées du film. Ce procédé convient spécialement pour générer des guides d'ondes de canal pour des circuits à ondes lumineuses planaires. Le profile (courbe en trait plein) de l'indice de réfraction d'un tel guide d'ondes est plus uniforme que le profile (courbe en pointillé) de l'indice de réfraction de l'art antérieur produit par un faisceau laser TEM¿00? et présente une perte par courbure réduite.

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