| 摘要 |
An embedded type optically irreversible circuit device which achieves both low insertion loss and high return loss is provided, in which an optical element, comprised of an incoming side polarizer, a Faraday rotator, and an outgoing side polarizer superposed in the order of mention in the direction of an optical path, is embedded in the optical path of an optical fiber or optical waveguide having an light axis, the device has a slot extending across the light axis in a direction slanted with respect to the light axis, the optical element is inserted in the slot and the spaces between the optical element and the incoming and outgoing sides of the slot are filled with an optical adhesive portion; and at least one of interfaces between the incoming side polarizer, the Faraday rotator, the outgoing side polarizer and the optical adhesive portions is inclined at an angle reversely from the plane normal to the light axis as viewed from the slanted incoming side of the slot.
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