| 摘要 |
PURPOSE:To prevent an error in measurement from being generated, by producing a state equivalent to mode distribution in an optical fiber for a long distance by adding disturbance on a mode positively. CONSTITUTION:The propagation mode of light being propagated in the optical fiber can be disturbed by cutting the end face of the tip of the optical fiber 1 at a constant angle (alpha), forming a coarse plane 3 on the end face of the cut plane, and converting the propagation directions of a reflected light component and a refracted light component at the plane to the ones different from the incident direction of the light at random. Therefore, the mode of the light being propagated in the optical fiber 1 is disturbed by the coarse plane 3, and the light whose mode is disturbed in the direction different from that of incident light is taken out and measured as a transmission light component or the reflected light component effectively, thereby, it is possible to respond by a small element. In such a way, it is possible to facilitate the characteristic evaluating work of an optical fiber carrying path and to improve working accuracy. |
