In-line optical isolator

Details In-line optical isolator In-line optical isolator

G - Physics

02

B

G02B 27/28 (2006.01)

Patent

CA 2530179

In conventional optical isolators, an optical signal is dispersed by polarization or the characteristics are varied by heat generation in a garnet crystal. According to the invention, the crystal optical axis (3c) of a rutile crystal (3) is oriented so that the separation directions of the ordinary ray O and the extraordinary ray E are perpendicular to the plane including the optical axes of optical fibers (10, 11). Furthermore, the focusing central optical axis (6c) of a focusing rod lens (6) is arranged parallel with optical axes of the optical fibers (10, 11) and at a substantially equal distance from the four rays, i.e. the ordinary ray O and the extraordinary ray E propagating along the optical axis of the optical fiber (10) and the ordinary ray O and the extraordinary ray E propagating along the optical axis of the optical fiber (11). An air gap (7) of about 200 [µm] is provided, as a heat insulating means, between the focusing rod lens (6) and a magnetized garnet crystal (8).

Dans les isolateurs optiques classiques, un signal optique est dispersé par polarisation ou bien les caractéristiques sont modifiées par génération de chaleur dans un cristal grenat. Conformément à l'invention, l'axe optique (3c) d'un cristal rutile (3) est orienté de sorte que les directions de séparation du rayon ordinaire O et du rayon extraordinaire E soient perpendiculaires au plan contenant les axes optiques de fibres optiques (10, 11). En outre, l'axe optique central de focalisation (6c) d'une lentille barreau de focalisation (6) est disposée parallèlement aux axes optiques des fibres optiques (10, 11) et à une distance sensiblement égale des quatre rayonnements, c'est-à-dire, le rayonnement ordinaire O et le rayonnement extraordinaire E qui se propagent le long de l'axe optique de la fibre optique (10) et le rayon ordinaire O et le rayon extraordinaire E qui se propagent le long de l'axe optique de la fibre optique (11). Un intervalle (7) d'environ 200 [µm] est prévu, en tant que moyen d'isolation thermique, entre la lentille barreau de focalisation (6) et un cristal grenat magnétisé (8).

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