Optical filter fabrication method and apparatus, optical...

G - Physics – 02 – B

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G02B 5/26 (2006.01) G02B 6/136 (2006.01) G02B 6/36 (2006.01) G02B 7/00 (2006.01)

Patent

CA 2242371

An optical filter is manufactured by placing a photosensitive optical fiber in a spiral arrangement on a fiber holder, preferably having a spiral groove for holding the fiber, and exposing the fiber to ultraviolet light through a phase mask having a spiral diffraction grating, forming an in-fiber Bragg grating. The fiber can be conveniently scanned by an ultraviolet beam as the fiber holder and phase mask turn on a rotating stage. The fiber can be compactly packaged between the fiber holder and a cover. The fiber holder and cover can be formed by coating a substrate with layers of polymer material, the spiral groove being formed by photolithographic patterning of one of the layers.

Pour fabriquer un filtre optique, il suffit de placer, de façon à ce qu'elle forme une spirale, une fibre optique photosensible sur un porte-fibre ayant, de préférence, une rainure spiralée pour ancrer la fibre. Cette dernière est alors soumise à de la lumière ultraviolette à travers un masque de phase muni d'un réseau de diffraction spiralé formant un réseau de Bragg dans la fibre. Cette dernière peut être facilement balayée par un faisceau ultraviolet au fur et à mesure que le porte-fibre et le masque de phase tournent sur un plateau tournant. La fibre peut être placée de façon compacte entre le porte-fibre et un couvercle. Ces derniers peuvent être formés en appliquant, sur un substrat, des couches de matériau polymérique, la rainure spiralée étant formée sur une des couches au moyen d'un photomasque.

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