Optical isolator

G - Physics – 02 – B

Patent

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Details

G02B 27/28 (2006.01) G02B 6/26 (2006.01) G02B 6/42 (2006.01) G02F 1/09 (2006.01)

Patent

CA 2069684

A high quality small-sized polarization independent optical isolator for use in an optical fiber communication system, wherein a pair of magneto-optical elements having Faraday rotation angle of 45 ~ 5 are contained in permanent magnets and arranged between a pair of birefringent crystal plates for splitting and combining an optical path of a laser light, and two polarizers arranged in parallel as being bounded on the midpoint of separated optical paths are interposed between the pair of magneto-optical elements, whereby a degree of worsening the optical isolation can be kept minimum against variations of an environmental temperature and wave length.

L'invention est un isolateur optique indépendant de la polarisation, de petite taille et de grandes dimensions, pour système de communication à fibres optiques. Cet isolateur comprend une paire d'éléments magnéto-optiques ayant un angle de rotation de Faraday de 40º qui sont incorporés à des aimants permanents et placés entre une paire de plaques de cristal biréfringent pour diviser et combiner un trajet optique de faisceau laser, et deux polarisateurs montés en parallèle au point milieu de trajets optiques distincts et interposés entre la paire d'éléments magnéto-optiques, de sorte que la dégradation de l'isolement optique peut être maintenue au minimum en cas de variation de la température ambiante et de la longueur d'onde.

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