Optical fibre filter

G - Physics – 02 – B

Patent

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Details

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

Patent

CA 2427353

An optical fibre filter (1, 1') comprises a dual-mode optical fibre (2) which includes a core (3) and a cladding (4) and through which an optical signal can pass; a pair of coupling regions (8, 9) formed in the optical fibre (2) at a predefined mutual distance (L) so as to produce a power transfer between a first and a second propagation modes (LP01, LP11) of the optical signal; and a phase shift region (10) defined by a section of the fibre (2) lying between the coupling regions (10) defined by a section of the fibre (2) lying between the coupling regions (8, 9), for producing a phase shift between the first and second propagation modes (LP01, LP11); in which, in the coupling regions (8, 9), the optical fibre (2) has, in cross section, an asymmetrical refractive index profile.

La présente invention concerne un filtre (1, 1') de fibre optique comprenant une fibre optique bimodale (2) qui comporte une âme (3) et une gaine (4) et à travers laquelle un signal optique peut passer; une paire de zones de couplage (8, 9) présentes dans la fibre optique (2) à une distance mutuelle prédéfinie (L) de façon à produire un échange d'énergie entre un premier et un deuxième mode de propagation (LP¿01?, LP¿11?) du signal optique; et une zone de déphasage (10) définie par une section de la fibre (2) s'étendant entre les zones de couplage (8, 9), de manière à produire un déphasage entre les premier et deuxième modes de propagation (LP¿01?, LP¿11 ?). Dans ce filtre, au niveau des zones de couplage (8, 9), la fibre optique (2) possède, en coupe, un profil d'indice de réfraction asymétrique.

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