| 摘要 |
An optical switch includes: an optical input-output port that includes three or more ports arranged along a predetermined arrangement direction; a spatial optical modulator that includes a light incident layer, a light reflective layer, and a spatial optical modulation layer disposed between the light incident layer and the light reflective layer, spatially modulates light entering the light incident layer from any port of the optical input-output port, and outputs the light spatially modulated toward any of other ports of the optical input-output port; and a condensing lens that optically couples the optical input-output port and the spatial optical modulator, wherein x 2 ‰ 2x 1 + x 0 holds where: a coordinate axis is set along the arrangement direction of the optical input-output port and a position of an optical axis of the condensing lens is set as an origin of the coordinate axis; x 0 , x 1 , and x 2 respectively are coordinates, in the optical input-output port, of a first port to or from which light is input or output, and a second port and a third port from or to which light input to or output from the first port is output or input; and x 1 and x 2 are greater than zero. |
