| 摘要 |
PURPOSE:To facilitate manufacture and to easily utilize the single polarization of optical communication by providing insertion parts which cut off an electromagnetic field in the lengthwise direction of a single-mode fiber axially symmetrically along both sides of the mode fiber of the single-mode fiber. CONSTITUTION:The insertion parts 4A and 4B which cut off the electromagnetic field in the lengthwise direction of the single-mode fiber are provided axially symmetrically along both sides of the mold fiber of the fiber. Those insertion parts 4A and 4B are made of a conductive material or magnetically permeable material such as metal. Consequently, a polarized wave which has a plane of polarization in an (x) direction containing said insertion parts 4A and 4B is cut off and only a polarized wave which has a plane of polarization in a (y) direction perpendicular to the (x) direction is propagated, thereby realizing substantially absolute single-polarization characteristics. Therefore, the manufacture is easy and low in cost and the single polarization of optical communication is easily utilized. |
