Phase mask for forming diffraction grating, and optical...

G - Physics – 02 – B

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G02B 5/18 (2006.01) G02B 6/02 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2426443

The present invention relates to a precision phase mask for forming diffraction grating in optical fiber and optical waveguide, to provide them with nonlinear chirped grating for dispersion compensation use and having low fluctuation or crosstalk in the group delay characteristics. The diffraction grating is formed by means of interference fringe between diffracted lights of different orders, in which the cycle of the diffraction grating (20) increases nonlinearly, wherein a plurality of diffraction gratings G1, G2, G3 ... having different cycles are assembled on a plane in increasing order of the cycle with the directions of the diffraction gratings directed to the same direction, and assembled in such a manner that, where the cycle of grating changes nonlinearly and discontinuously, the regions having larger rate of change of the cycle contain proportionally more discontinuous phases per unit length.

La présente invention concerne un masque de phase de précision pour la formation d'un réseau de diffusion dans des fibres optiques et des guides d'ondes optiques, afin de les munir d'un réseau compressé non linéaire pour la compensation pour la dispersion, et pour obtenir des caractéristiques de temps de propagation de groupe à faible niveau de fluctuation ou de diaphonie. Le réseau de diffusion est formé au moyen d'une frange d'interférence entre les lumières diffractées de divers niveaux, où le cycle du réseau de diffraction (20) augmente de façon non linéaire, et où une série de réseaux de diffraction (G1, G2 et G3, etc.) avec des cycles distincts est assemblée sur plan par ordre de croissance du cycle, les réseaux de diffraction étant orientés dans la même direction, et assemblés et telle sorte que lorsque le cycle de réseautage change de façon non linéaire et discontinue, les régions ayant les taux de changement de cycle les plus élevés contiennent proportionnellement plus de phases discontinues par unité de longueur.

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