| 摘要 |
PURPOSE:To achieve exchange at the stage of light, by using a special refractive phenomenon observed in a biaxial crystal. CONSTITUTION:(m) Sets of signal lights 1-6 are parallel with lenses 11-16, etc. and the parallel rays enter a biaxial crystal 101 for synthesis so that the polarized direction of the respective light is in parallel with a plane including the optical axis and the incident point with polarized elements 21-26, etc. This synthesized light is made optically rotate at an optical rotatory element 107, and is made incident to the 2nd biaxial crystal 102 so that the normal of wave plane of refracted light can be coincident with the optial axis. A light through an end surface 108 of the crystal 102 enters an isotropic medium 103 which is transparent, and one signal light is picked up at a reflecting plane 104, collected at a lens 105 and transmitted to an optical fiber 100. The optical signals of the remaining (m-1) lines are transmitted to a biaxial crystal 201 at the next step and similarly, an arbitrary signal light is transmitted to an optical fiber 200 with a reflecting plane 204. Similarly, the signal light is selected and transmitted to optical fiber 300-. |
