| 摘要 |
PURPOSE:To obtain an optical branching coupler, by using a polarizing filter which divides light into two parts. CONSTITUTION:An optical fiber 21 is set at the left of a branching polarizing filter 29 and a coupling polarized filter 28 in parallel to the filter 29 at the other side of the filter 29. Furthermore, an optical fiber 23 is provided to form a coupling input optical path going toward the filter 28. Then optical fibers 22 an 24 pick up the reflected beams of both filter 28 and 29. In such constitution, the fibers 22 and 24 are not set on the same straight line and therefore the P wave delivered from the fiber 23 never enters the fiber 22. It is possible to obtain an optical branching coupler having such an effect even by use of a relfector 30. |
