Polarization-independent optical isolator

Details Polarization-independent optical isolator Polarization-independent optical isolator

G - Physics

02

B

G02B 6/24 (2006.01) G02B 6/26 (2006.01) G02F 1/09 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2195086

The present invention relates, to an optical isolator for interrupting reflection-returned light from going back in an optical system in the case of optical fiber communication, inputting and outputting of optical discs, etc. using semiconductor laser. It is an object of the present invention in connection with the polarization-independent optical isolator to make unnecessary a complicated and difficult step for optically connecting the lenses and the optical fibers so as to collimate the light emitted from the light- incident side optical fiber, enhance the efficiency in coupling the light with the light-emitting side optical fiber again and prevent the return light from being coupled with the light-incident side optical fiber again. A polarization-indepedent optical isolator according to the present invention comprises a light- incident side optical fiber having a diameter of a core expanded to give a mode field diameter at an end face being 20 to 50 µm, a light-emitting side optical fiber having a diameter of a core expanded to give a mode field diameter at an end face being 20 to 50 µm, and an optical isolator element provided. between the light- incident side optical fiber and the light-emitting side optical fiber, said optical isolator element comprising a first polarization beam splitter located at a side of the light-incident side optical fiber, a second polar- ization beam splitter located at a side of the light- emitting side optical fiber, and a Farady rotator provided between the first polarization beam splitter and the second polarization beam splitter, and at least said first polarization beam splitter being a wedge type polarization beam splitter. -35-

Isolateur optique destiné à bloquer la réflexion de la lumière dans un système optique de dispositifs d'entrée/sortie utilisant un laser à semi-conducteur pour les communications optiques, un disque optique, etc. Selon cet isolateur, lequel est indépendant de la polarisation, la cohérence de la lumière provenant d'une fibre optique d'entrée et l'efficacité du recouplage optique vers une fibre optique de sortie sont améliorés, et on peut empêcher le recouplage de la lumière de retour vers la fibre optique d'entrée sans interventions compliquées et difficiles pour obtenir un couplage entre des lentilles et des fibres. Plus concrètement, l'isolateur optique indépendant de la polarisation comprend des fibres optiques d'entrée et de sortie agrandies pour présenter un diamètre de champ à mode compris entre 20 et 50 mu m au niveau de leurs extrémités, et un élément isolateur optique interposé entre les fibres optiques d'entrée et de sortie, l'élément isolateur comprend un premier diviseur de faisceau polarisant positionné du côté entrée, un second diviseur de faisceau polarisant positionné du côté sortie, et un rotor de Faraday entre le premier diviseur de faisceau polarisant et le second diviseur de faisceau polarisant, et au moins le premier diviseur de faisceau polarisant est un diviseur de faisceau en forme de coin.

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