Optical tapping filters employing long period gratings

H - Electricity – 04 – J

Patent

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H04J 14/02 (2006.01) G02B 5/20 (2006.01) G02B 6/34 (2006.01) H04B 10/12 (2006.01)

Patent

CA 2168902

An optical filter comprises a plurality of optical fibers having a coupling region where the axially extending cores are closely spaced within a common cladding. The coupling region includes a long period grating for selectively shifting light of selected wavelengths from guided modes into non-guided modes. These non-guided modes are picked up by an adjacent core and light of the selected wavelengths is thus shifted from one core to another. The result is an optical filter particularly useful as a demultiplexer or a tapping device. In one embodiment the grating is formed in one of the cores. In an alternative embodiment, it is formed in the common cladding.

L'invention est un filtre optique comportant une pluralité de fibres optiques ayant une région de couplage où les âmes axiales sont rapprochées les unes des autres et entourées d'une gaine commune. La région de couplage comprend un réseau à période longue servant à faire passer la lumière à certaines longueurs d'onde particulières d'un mode de propagation guidée à un mode de propagation non guidée. La lumière en propagation non guidée est recueillie par une âme adjacente et la lumière aux longueurs d'onde particulières sélectionnées passe donc d'une âme à une autre. On obtient ainsi un filtre optique particulièrement utile comme démultiplexeur ou dispositif de dérivation. Dans l'une des concrétisations de l'invention, le réseau est formé dans l'une des âmes. Dans une autre concrétisation, il est formé dans la gaine commune.

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