| 摘要 |
Light input from a first optical fiber is split up into two orthogonally-polarized beams by a polarizing prism. Their polarization planes are rotated by a 45-degree Faraday rotator. The beams are refracted by a birefringent wedge as extraordinary light, and finally output to a fourth optical fiber. The light output from the fourth optical fiber is refracted by a birefringent wedge as ordinary light, and enters a second optical fiber. Similarly, the light from the second optical fiber is led to a third optical fiber, thereby implementing a capability of an optical circulator. Light output from the first optical fiber can be input to the third optical fiber by inverting a rotation angle of the 45-degree Faraday rotator. As a result, it serves as a magneto-optical switch.
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