Optical fiber grating device

Details Optical fiber grating device Optical fiber grating device

G - Physics

02

B

G02B 6/028 (2006.01) G02B 5/18 (2006.01) G02B 6/10 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2390210

An optical fiber grating device (1) comprising an optical fiber (10) that has a core region (11) having an index of refraction n1 and an outside diameter 2a and having a long-period grating (14), a first clad region (12) surrounding the core region (11) and having an index of refraction n2 and an outside diameter 2b, and a second clad region (13) surrounding the first clad region (12) and having an index of refraction n3 and an outside diameter 2c. The relationship among the indexes of refraction n1, n2, n3 is n1>n2>n3. The relative refractive-index difference .DELTA.n2 of the first clad region (12) with respect to the second clad region (13) is 0.5 % or more. The thickness (c- b) of the second clad region (13) with respect to the cutoff peak wavelength .lambda. ranges from .lambda. to 10.lambda..

L'invention concerne un dispositif de réseau à fibre optique (1) qui comprend une fibre optique (10) possédant une zone centrale (11) avec un indice de réfraction n¿1? et un diamètre extérieur 2a, un réseau à longue période (14), une première zone gaine (12) entourant la zone centrale (11) et possédant un indice de réfraction n¿2? et un diamètre extérieur 2b, et une seconde zone gaine (13) entourant la première zone gaine (12) et possédant un indice de réfraction n¿3? et un diamètre extérieur 2c. La relation entre les indices de réfraction n¿1?, n¿2?, n¿3? est la suivante: n¿1?>n¿2?>n¿3?. La différence d'indice de réfraction relative .DELTA.n¿2? de la première zone gaine (12) par rapport à la seconde zone gaine (13) est égale ou supérieure à 0,5 %. L'épaisseur (c-b) de la seconde zone gaine (13) par rapport à la longueur d'onde .lambda. de sommet de coupure est comprise entre .lambda. et 10.lambda..

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