| 摘要 |
<p>A reflecting-mirror-type variable optical attenuator according to the present invention is formed of a collimator lens (12) with optical fibers in which two optical fibers (8,9) are attached to a rod lens (12) in respective positions off-centered from the optical axis of the rod lens and a linearly movable reflecting mirror (20). A phenomenon that the optical axis of a light beam emitted from one optical fiber deviates from the optical axis of the collimator lens by the angle according to the off-centered distance on the surface of the rod lens is utilized. That is, by changing the distance (S) between the surface of the reflecting mirror arranged to be linearly movable in the optical axis direction and the surface of the rod lens, input light from one fiber is attenuated to be output to the other. A guide pin (16) and an electrical motor (21) are used to control the mirror displacement. <IMAGE></p> |
