Wedge-shaped liquid-crystal cell

G - Physics – 02 – F

Patent

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Details

G02F 1/1333 (2006.01) G02F 1/31 (2006.01) H04Q 11/00 (2006.01)

Patent

CA 2277311

A liquid-crystal cell having plates defining a gap between them which is filled with a liquid crystal, especially a twisted nematic. The plates are made non-parallel to a predetermined degree so that the liquid crystal assumes a wedge shape, producing different effective thicknesses of the liquid crystal depending on the lateral position within the cell. In use, a narrow beam irradiates a portion of the cell, and the cell is positioned along the wedge direction so as to optimize the cell performance. The invention is particularly useful with a liquid-crystal multi-wavelength switch, which requires extinction ratios between the two states of the cell. Such a switch is used in a wavelength-division multiplexed communication system based on optical fiber.

Cette invention se rapporte à une cellule à cristal liquide dotée de plaques délimitant un espace qui est rempli de cristal liquide, notamment du type nématique en hélice. Les plaques ne sont pas disposées de manière parallèle mais de manière à former un angle préétabli de sorte que le cristal liquide prenne la forme d'un coin, produisant ainsi différentes épaisseurs efficaces de cristal liquide en fonction de la position latérale au sein de la cellule. En cours d'utilisation, un étroit faisceau irradie une partie de la cellule, et la cellule est positionnée suivant la direction du coin de manière à ce que sa performance soit optimale. Cette invention est particulièrement adaptée à un commutateur multi-longueur d'onde à cristal liquide, qui nécessite des rapports d'extinction entre les deux états de la cellule. Ce type de commutateur est utilisé dans les systèmes de communication multiplexé en longueur d'onde utilisant des fibres optiques.

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