Optical demultiplexing/multiplexing device having a...

H - Electricity – 04 – J

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H04J 14/02 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2246570

A device capable of demultiplexing or multiplexing optical signals includes a wavelength dependent element for separating an input beam into sub-beams of light in accordance with their wavelength. Precisely spaced optical fibres are disposed to receive at least some of the sub-beams of light; a focusing lens is disposed between the wavelength dependent element and the optical fibres for focusing the sub-beams at ends of the optical fibres. A rod-like GRIN lens for correcting for an offset in the focal length of the focusing lens is placed between the focusing lens and the optical fibres. The GRIN lens can be polished to change its length in order to correct for the offset in focal length of the focusing lens.

Dispositif pouvant multiplexer ou démultiplexer des signaux optiques, comprenant un élément dépendant de la longueur d'onde pour diviser un faisceau d'entrée en faisceaux secondaires de lumière, selon leur longueur d'onde. Des fibres optiques à espacement précis sont disposées pour recevoir au moins une partie des faisceaux secondaires de lumière. Une lentille de focalisation est disposée entre l'élément sensible à la longueur d'onde et les fibres optiques pour focaliser les faisceaux secondaires aux extrémités des fibres optiques. Une lentille barreau à gradient d'indice pour corriger un décalage de la distance focale de la lentille de focalisation est placée entre la lentille de focalisation et les fibres optiques. La lentille barreau à gradient d'indice peut être polie de manière que sa distance focale soit modifiée afin de compenser le décalage de la distance focale de la lentille de focalisation.

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