| 摘要 |
PURPOSE:To change the proportion of light branched from a first optical fiber to a second optical fiber in a wide range by bending the first optical fiber and changing the radius of curvature of the bending part. CONSTITUTION:An optical fiber pressing member 5 is rotated to move a front end part 5b forward or backward in the radial direction of curvature of a bending part 2a. the pressing force applied from the front end part 5b to the bending part 2a is adjusted by this forward or backward movement to change the radius of curvature of the bending part 2a. According as the radius of curvature of the bending part 2a is changed, the proportion of conversion from the waveguide mode to the leak mode in the bending part 2a is changed. Thus, the proportion of light branched from the first optical fiber 2 to the second optical fiber 3 is changed in a wide range. |
