JPS63120221U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1A is a schematic diagram showing an example of the optical circulator of the present invention, and FIG. 1B is a diagram of the optical axis of the birefringent crystal plate used therein projected onto the X and Y planes.
Fig. 1C is a schematic diagram showing an example of the optical fiber fixing member used in the present invention, Fig. 2 is an explanatory diagram of the circulator function of the present invention, and Figs. 3A and 3B show examples of use of the circulator of the present invention. 4 is a characteristic diagram for explaining the effect of the present invention, FIG. 5 is a schematic diagram showing a conventional optical circulator with polarization dependence, and FIG. 6 is a diagram showing a conventional optical circulator with polarization dependence. FIG. 7 is a schematic diagram showing a conventional optical circulator having polarization dependence in only one direction, and FIG. 8 is a schematic diagram of an optical circulator previously proposed by the present inventor. 1, 8... Glass plate, 2, 4, 7... Birefringent crystal plate, 3, 5... Magneto-optic effect plate, 6... Lens, 9... Magnet, 10... Optical circulator, FB1 to FB3
...first to third optical fibers, GL...fixing member.

Claims (1)

[Claims for Utility Model Registration] (1) An optical circulator having first, second and third optical fibers, wherein a first optical fiber is provided between the first and third optical fibers and the second optical fiber. The birefringent crystal plate, the first magneto-optic effect plate, the second birefringent crystal plate, the second magneto-optic effect plate, and the third birefringence crystal plate are arranged in this order and integrated, and from the first optical fiber. A function is provided in which only a certain polarized component of the incident light is emitted from the second optical fiber as transmitted light, and the light incident from the second optical fiber is emitted from the third optical fiber as received light. Characteristic optical circulator. (2) The first and third optical fibers are inserted and fixed in a member having a hollow having a diameter approximately twice the diameter of the fiber so that the two fibers are substantially in contact with each other. The optical circulator according to item 1. (3) The optical circulator according to claim 1 or 2, wherein the magneto-optic effect plate is made of a garnet single crystal with a large amount of Bi substituted. (4) The optical circulator according to any one of claims 1 to 3, wherein the birefringent crystal plate is a rutile plate or one using a cleavage plane of calcite.