Depressed cladding fiber design for reducing coupling to...

G - Physics – 02 – B

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G02B 6/036 (2006.01)

Patent

CA 2293654

A waveguide, such as an optical fiber waveguide for guiding light waves, which can provide a strongly reflective grating (e.g., a Bragg grating) at a specified wavelength while maintaining very low losses at adjacent wavelengths. The waveguide includes a core, an inner cladding laterally surrounding the core, an outer cladding laterally surrounding the inner cladding, and a grating pattern. The core has a refractive index nco and a first transverse dimension 2A. The inner cladding has a width W and a refractive index nic. The outer cladding has a refractive index noc. The relation between the refractive indexes, nconocnic and 0,5A/(A+W)1, define a narrow depressed well region for limiting cladding losses.

L'invention concerne un guide d'onde, par exemple un guide d'onde à fibres optiques servant à guider des ondes lumineuses, qui peut fournir un réseau fortement réfléchissant (par ex. un réseau de Bragg) à une longueur d'onde spécifiée tout en maintenant de très faibles pertes aux longueurs d'onde adjacentes. Ce guide d'onde comprend un coeur, une gaine intérieure entourant latéralement le coeur, une gaine extérieure entourant latéralement la gaine intérieure, et un motif de réseau. Le coeur présente un indice de réfraction n¿co? et une première dimension transversale 2A. La gaine intérieure présente une largeur W et un indice de réfraction n¿ic?. La gaine extérieure présente un indice de réfraction n¿oc?. La relation entre les indices de réfraction, n¿co??n¿oc??n¿ic? et la relation 0,5?A/(A+W)?1, définissent une région de puits enfoncé étroit servant à limiter les pertes de gaine.

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