Planar lightwave circuit with mode coupling and mode...

G - Physics – 02 – B

Patent

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G02B 6/14 (2006.01)

Patent

CA 2554553

A flat optical circuit which can be easily produced by the existing flat optical circuit producing process, is reduced in the propagation loss of a signal light, and can convert an input signal light to retrieve a desired signal light. The flat optical circuit, which is formed on a substrate and is composed of a core and a clad, comprises at least one input light waveguide (111) for receiving a signal light, a mode coupling means (112) for coupling a base mode that is part of the input signal light with at least one of a high- order mode and a radiation mode or a mode re-coupling means (113) for re- coupling at least one of a high-order mode and a radiation mode with a base mode, and at least one output light waveguide (114) for outputting a signal light, characterized in that the mode coupling means or the mode re-coupling means is an optical waveguide having at least one of a core width and height varied continuously.

L~invention porte sur un circuit optique plat que l~on peut facilement obtenir selon le procédé de fabrication existant de circuit optique plat, tout en réduisant la perte de propagation d~une lumière de signal et susceptible de convertir une lumière de signal d~entrée pour récupérer une lumière de signal désirée. Le circuit optique plat, qui est formé sur un substrat et se compose d~un noyau et d~un revêtement, comprend au moins un guide d~onde de lumière d~entrée (111) pour recevoir une lumière de signal, un moyen de couplage de mode (112) pour coupler un mode de base faisant partie de la lumière de signal d~entrée avec au moins un élément pris parmi un mode de rang élevé, un mode de rayonnement ou un moyen de recouplage de mode (113) pour recoupler au moins un élément pris parmi un mode de rang élevé et un mode de rayonnement avec un mode de base, et au moins un guide d~onde de lumière de sortie (114) pour générer une lumière de signal, caractérisé en ce que le moyen de couplage de mode ou le moyen de recouplage de mode est un guide d~onde optique ayant au moins la largeur ou la hauteur de noyau modifiée en continu.

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