| 摘要 |
PURPOSE:To easily and simply measure flexural losses corresponding to many bending diameters in a short time by rotating either end part side of an optical fiber by a rotating device. CONSTITUTION:When an arm 6 is rotated stepwise gradually by the rotating device 7 up to 90 deg., the end part side of the optical fiber 1 is rotated together with a mandrel 11 and a detector 5. Thus, the fiber 1 is bent gradually along one of columnar flanks 21-23.... At this time, the light which is made incident on the fiber 1 from a light source 4 is propagated to the other end and detected by the detector 5, whose output is sampled in order to measure the relation between the bending distance and flexural loss at the time of a specific diameter of bending. Then the mandrel 11 on the projection end side removes a generated clad mode due to the bending of the fiber 1 along the columnar flanks 21-23..., and consequently measurement errors are removed to measure the accurate loss. |
