Optical fiber

G - Physics – 02 – B

Patent

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G02B 6/02 (2006.01)

Patent

CA 2571142

The present invention concerns an optical fiber acting as a slab-coupled waveguide. The optical fiber has a cross-section comprising a core (1), which is two dimensional and responsible for the horizontal confinement of the fiber's fundamental mode. A slab (2) is placed in the vicinity of the core (1). The slab (2) extends substantially in a plane, acts as a mode sink for the core, and is at least three times wider than the core (1). A cladding (3) surrounds the core (1) and the slab (2). The cladding (3) is made of one or several materials with refractive indices lower than the core and slab materials. The core (1), slab (2) and cladding (3) and any other protective or supportive structures attached to them form an overall structure that determines the mechanical properties of the fiber. The cross-section of the fiber is formed to make the fiber significantly more flexible in the direction perpendicular to the plane of the slab than in the plane of the slab.

La présente invention concerne une fibre optique qui fonctionne en tant que guide d'ondes couplé au lingot. La fibre optique présente une section transversale comprenant une âme (1) qui est bidimensionnelle et responsable du confinement horizontal du mode principal de vibration de la fibre. Un lingot (2) est placé au voisinage de l'âme (1), ce lingot (2) s'étendant sensiblement dans un plan, et agissant en tant que dissipateur de mode pour l'âme, sa taille étant trois fois plus importante que celle de l'âme (1). Un revêtement (3) entoure l'âme (1) et le lingot (2). Ce revêtement (3) est formé d'au moins un matériau dont l'indice de réfraction est inférieur à celui des matériaux de l'âme et du lingot. L'âme (1), le lingot (2) et le revêtement (3) et tout autre structure de protection ou de support fixée à ces derniers, forment une structure complète qui détermine les propriétés mécaniques de la fibre. La section transversale de la fibre est formée de telle sorte que la fibre soit significativement plus souple dans la direction perpendiculaire au plan du lingot que dans le plan du lingot.

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