Hydrogen-resistant optical fiber/grating structure suitable...

G - Physics – 02 – B

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G02B 6/02 (2006.01) C03C 13/04 (2006.01)

Patent

CA 2687970

A hydrogen-resistant optical fiber particularly well-suitable for downhole applications comprises a relatively thick pure silica core and a depressed-index cladding layer. Interposed between the depressed-index cladding layer and the core is a relatively thin germanium-doped interface. By maintaining a proper relationship between the pure silica core diameter and the thickness of the germanium-doped interface, a majority (preferably, more than 65%) of the propagating signal can be confined within the pure silica core and, therefore, be protected from hydrogen-induced attenuation problems associated with the presence of germanium (as is common in downhole fiber applications). The hydrogen-resistant fiber of the present invention can be formed to include one or more Bragg gratings within the germanium-doped interface, useful for sensing applications.

Fibre optique résistant à l'hydrogène, convenant particulièrement bien pour les applications à fond de trou, qui comprend une âme relativement épaisse de silice pure et un couche de gainage à indice diminué. Une interface dopée au germanium relativement mince vient s'intercaler entre la couche de gainage à indice diminué et l'âme. Le maintien d'un rapport appropriée entre le diamètre de l'âme de silice pure et l'épaisseur de l'interface dopée au germanium permet de confiner la majeure partie ( de préférence plus de 65%) du signal de propagation dans l'âme de silice pure et donc de protéger ce signal contre les problèmes d'atténuation induits par l'hydrogène associés à la présence de germanium (ce qui est courant dans les applications de fibres à fond de trou). Cette fibre résistant à l'hydrogène peut être conçue de manière à inclure un ou des faisceaux de Bragg dans l'interface dopée au germanium, ce qui est utile pour les applications de détection.

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