Mode adaption for multimode optical fiber systems

Details Mode adaption for multimode optical fiber systems Mode adaption for multimode optical fiber systems

G - Physics

02

B

G02B 6/26 (2006.01) G02B 6/122 (2006.01) G02B 6/14 (2006.01) G02B 6/42 (2006.01)

Patent

CA 2388997

A single mode waveguide coupling to a multimode fiber (14) of a high-bandwidth local optical network is made by a tapered coupler (10) that expands the spot size of the propagating beam to fill additional modes of the multimode fiber. The tapered coupler has a core (30) surrounded by inner (32) and outer (34) layers of cladding. The core and the inner cladding layer are drawn down along their length to force light from the core into the surrounding inner cladding layer. The outer cladding layer confines the expanded beam within the core and inner cladding layer.

Selon l'invention, on effectue un couplage de guide d'onde à mode unique sur une fibre optique multimode (14) d'un réseau optique local en bande large à l'aide d'un coupleur effilé (10) qui augmente le diamètre de point du faisceau de propagation afin de remplir les modes supplémentaires de la fibre multimode. Le coupleur effilé comporte un noyau (30) entouré par une couche de métallisation intérieure (32) et une couche de métallisation extérieure (34). Le noyau et la couche de métallisation intérieure sont étirés sur leur longueur afin de contraindre la lumière provenant du noyau à pénétrer dans la couche de métallisation intérieure environnante. La couche de métallisation extérieure confine le faisceau augmenté à l'intérieur du noyau et de la couche de métallisation intérieure.

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