Optical device and bidirectional communications system

Details Optical device and bidirectional communications system Optical device and bidirectional communications system

G - Physics

02

B

G02B 6/26 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01) H04B 10/24 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2200235

An optical device employing a GRIN rod lens, which optical device makes full use of the characteristics of a single-mode optical fiber and which permits extremely easy adjustment; an optical wavelength demultiplexer/multiplexer which utilizes a GRIN rod lens and a pass filter; and a bidirectional communications system which utilizes a pair of the aforesaid optical wavelength demultiplexers/multiplexers. The optical device is constructed by a GRIN rod lens, a reflecting surface which is disposed on one end surface of the GRIN rod lens, and a ferrule which supports the distal ends of a first optical fiber and a second optical fiber symmetrically with respect to a central axis thereof and which is connected to the other end surface of the GRIN rod lens with the central axis thereof aligned with the optical axis of the GRIN rod lens. The core diameter of the second optical fiber is made sufficiently larger than the core diameter of the first optical fiber. The first optical fiber is a single-mode optical fiber, while the second optical fiber is a multi-mode optical fiber.

L'invention est un dispositif optique utilisant une lentille barreau à gradient d'indice utilisant les caractéristiques d'une fibre optique monomode pour procurer une très grande facilité d'ajustement. Cette lentille barreau et un filtre de dérivation sont incorporés à un démultiplexeur/multiplexeur optique et une paire de tels démultiplexeurs/multiplexeurs optiques sont incorporés à un système de communication bidirectionnel. Le dispositif optique de l'invention utilise une lentille barreau à surface réfléchissante à l'une de ses extrémités, et une férule qui supporte les extrémités distales de deux fibres optiques symétriques par rapport à leur axe central et qui est connectée à la surface de l'autre extrémité du barreau, l'axe optique étant aligné avec l'axe central des fibres optiques. Le diamètre du coeur de la seconde fibre optique est sensiblement plus grand que celui de la première. La première fibre optique est une fibre monomode, alors que la seconde est une fibre multimode.

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