| 摘要 |
An optical switch include a switch unit including a light reflection unit of which the reflection direction is changeable, the switch unit configured to optically connect an input port to an output port via the light reflection unit by changing the reflection direction of the light reflection unit; a determining light input unit configured to input into a first predetermined port a determining light for determining malfunctions in the light reflection unit; a light detection unit configured to detect the determining light from the output from a second predetermined port; and a malfunction determining unit configured to determine that abnormalities have occurred when the determining light is detected by the light detection unit.
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