Formation of a refractive index grating

G - Physics – 02 – B

Patent

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G02B 5/26 (2006.01) G02B 5/18 (2006.01) G02B 5/32 (2006.01) G02B 6/10 (2006.01) G02B 6/12 (2006.01) G02B 27/42 (2006.01) G03H 1/02 (2006.01) H04B 10/02 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2239730

An apodised refractive index grating is recorded in a photosensitive optical fibre by forming first and second component interference patterns with different pitches, that are recorded in the grating such as to result in apodisation. The component patterns (16, 17) are spatially in phase in a central region and move progressively out of phase towards the ends of the patterns. The patterns may be recorded sequentially or concurrently. The fibre may be stretched one or cyclically.

Selon l'invention, un réseau à indice de réfraction apodisé est enregistré dans une fibre optique photosensible en formant des premier et deuxième motifs de composantes. Ces motifs présentent des pas différents qui sont enregistrés dans le réseau de manière à se traduire par une apodisation. Les motifs de composantes (16, 17) sont spatialement en phase dans une zone centrale et se déplacent progressivement pour se déphaser en direction des extrémités des motifs. Ceux-ci peuvent être enregistrés de manière séquentielle ou concommittante. La fibre peut être étirée ou mise en rotation.

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