Chiral fiber bragg grating

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 37/075 (2006.01) G02B 6/10 (2006.01)

Patent

CA 2443985

A fiber Bragg grating comprises a chiral fiber (10) mimicking a cholesteric liquid crystal structure, having a first and a second helical structures (22,24) disposed along its central longitudin al axis, where the second helical structure (24) is identical in orientation to the first helical structure (22) but is shifted by one half of the structure's pitch forward. In another embodiment of the invention, only a single helical structure is disposed along the fiber to create an optically resonant chiral fiber.

La présente invention concerne un réseau de Bragg comprenant une fibre chirale qui imite une structure de cristal liquide cholestérique. Ce réseau de Bragg présente une première structure hélicoïdale et une seconde structure hélicoïdale, qui sont placées le long de son axe longitudinal. La seconde structure hélicoïdale présente la même orientation que la première structure hélicoïdale, mais est décalée d'un demi pas en avant. Dans un autre mode de réalisation de la présente invention, une seule structure hélicoïdale est placée le long de la fibre, afin de créer une fibre chirale à résonance optique.

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