Wavelength selective fiber to fiber optical tap

G - Physics – 02 – B

Patent

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G02B 6/34 (2006.01) G02B 5/26 (2006.01) G02B 6/293 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2224209

Light is coupled out of a first mono-mode optical waveguide such as an optical fiber an into another single mode waveguide through a substantially planar slab waveguide. The first mono-mode optical waveguide has a grating impressed within which has refractive index perturbations that reflect predetermined wavelengths of incident light out of a portion of a side of the optical waveguide adjacent the grating; The slab planar waveguide has an end optically coupled to the portion of the first mono-mode optical waveguide, for guiding light coupled out of the side of the waveguide, and for maintaining a uni-phase wavefront of said light by having a response that confines the light to a single mode in one dimension, and multi-mode in another dimension and allows at least a portion of the light to converge.

La lumière est couplée d'un premier guide d'ondes optique monomode, par exemple une fibre optique, à un autre guide d'ondes monomode au moyen d'un guide d'ondes bidimensionnel essentiellement planaire. Le premier guide d'ondes optique monomode comporte un réseau imprimé dont les perturbations d'indice de réfraction réfléchissent des longueurs d'onde prédéterminées de lumière incidente hors d'une section d'un côté du guide d'ondes optique adjacent au réseau. Le guide d'ondes planaire bidimensionnel comporte une extrémité couplée optiquement à la section du premier guide d'ondes optique monomode, pour guider la lumière couplée hors du côté du guide d'ondes et pour maintenir un front d'ondes monophase de ladite lumière au moyen d'une réponse qui limite la lumière à un seul mode dans une dimension et à des modes multiples dans une autre dimension et qui permet la convergence d'au moins une partie de la lumière.

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