A photonic crystal fibre and a method for its production

G - Physics – 02 – B

Patent

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Details

G02B 6/02 (2006.01) C03B 37/012 (2006.01) C03B 37/028 (2006.01) C03B 37/075 (2006.01) G02B 1/02 (2006.01)

Patent

CA 2368778

This invention relates to an optical fibre that comprises a core (4) of lower refractive index that is surrounded by a cladding which includes regions of a higher refractive index and is substantially periodic, where the core (4) has a longest transverse dimension that is longer than a single, shortest period of the cladding. In a fibre of this type light is substantially confined to the core area by virtue of the photonic band gap of the cladding material. The invention also relates to a method of manufacturing such an optical fibre, comprising the steps of forming a stack of canes (5), the stack (5) including at least one truncated cane (6) that defines an aperture (7), and then drawing the stack (5) into a fibre having an elongate cavity. The fibre is suitable for high power uses, but is equally suitable for other areas, e.g. optical amplifiers, spectral filters, lasers, gas sensors and telecommunications networks.

Cette invention concerne une fibre optique qui comprend un noyau (4) d'indice de réfraction plus faible entouré d'un gainage sensiblement périodique incluant des régions d'indice de réfraction plus élevé. Ce noyau (4) possède une dimension transversale de plus grande longueur, plus longue que la seule période la plus courte du gainage. Dans une fibre de ce type, la lumière est sensiblement confinée dans la région du noyau du fait de la largeur de bande interdite photonique du matériau du gainage. Cette invention concerne aussi un procédé de fabrication de cette fibre optique qui consiste à: empiler les tiges (5), l'empilement (5) comprenant au moins une tige tronquée (6) qui définit une ouverture (7), puis à tirer cet empilement (5) dans une fibre possédant une cavité allongée. Cette fibre convient à des utilisations de haute puissance, mais convient également à d'autres domaines, par exemple à ceux des amplificateurs optiques, des filtres spectraux, des lasers, des capteurs de gaz et des réseaux de télécommunication.

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