| 摘要 |
PURPOSE:To make a branch ratio variable, by providing plural branch factor parts on an optical branch part, and moving it vertically to an incident optical axis. CONSTITUTION:Light which is made incident from an optical fiber 4a becomes a parallel luminous flux by a rod lens 1a and is made incident to an optical prism 12. The incident light reaches an optical branch part 13, the light reflected by this part passes through a rod lens 1b and a connector 11b, is outputted to an optical fiber 4b, and on the other hand, the transmitted light passes through a rod lens 1c and a connector 11c and is outputted to an optical fiber 4c. The optical prism 12 is capable of moving in the vertical direction against the optical axis. The optical branch part 13 is constituted of a semitransparent mirror having 3 kinds of branch factors, or a reflector having a transparent part partially. |
