Photonic crystal fiber

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 37/028 (2006.01) C03B 37/012 (2006.01)

Patent

CA 2355678

Disclosed is an optical waveguide fiber preform which is an assembly of one or more core rods (14) surrounded by a plurality of clad rods (10). The clad rods (10) have a central portion (12) and a surrounding layer (22), in which the refractive index of the central portion is lower than that of the surrounding layer. The preform is drawn into an optical waveguide fiber that has a two component clad layer. Proper choice of the central portion (12) and surrounding layer provide a waveguide fiber that is endlessly single mode. Alternative embodiments include fibers containing dopants that enhance fiber photosensitivity or which provide stress-induced or asymmetric-refractive- index-induced birefringence in the waveguide fiber.

Cette invention a trait à une préforme de fibre optique guide d'ondes constituée d'un ensemble d'âmes (14) entouré par plusieurs gaines (10). Celles-ci (10) sont constituées d'une partie centrale (12) et d'une couche enveloppante (22), l'indice de réfraction de la partie centrale étant inférieur à celui de la couche enveloppante. La préforme est étirée pour donner une fibre optique guide d'ondes possédant une couche de gainage à deux composants. Un choix approprié de la partie centrale (12) permet d'obtenir une fibre guide d'ondes monomode en continu. D'autres réalisations portent sur des fibres renfermant des dopants renforçant la photosensibilité de la fibre ou assurant à la fibre guide d'ondes une biréfringence provoquée par une contrainte ou par un indice de réfraction asymétrique.

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