| 摘要 |
An optical isolator constituted by disposing optical elements comprising at least three polarizers and two faraday rotators with respect to a forward direction of light, wherein magnets, which are magnetized so that these magnetic poles are different from each other, are oppositely disposed by inserting the optical elements therebetween, the optical elements are constituted by disposing a first polarizer, a first faraday rotator, a second polarizer, a second faraday rotator and a third polarizer in order, the first and the third polarizers have the same transmission polarizing direction, and a faraday rotation direction of the first faraday rotator is different from that of the second faraday rotator toward a forward direction of light, and there is provided a reliable, productive and low cost multistage optical isolator having high backward loss and that both an incident and exit transmission polarizing directions are identical with each other.
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