| 摘要 |
PURPOSE: To individually perform optical reflection measurement of the respective branched transmission lines of an optical subscriber transmission line in one-to-multiple connection by respectively setting specified filter means. CONSTITUTION: When discontinuity is present on the branched transmission line to an optical subscriber equipment 4, in an optical reflection measurement device 5, reflected light from a discontinued point is observed. Further, only the variable wavelength filter 7 of the branched transmission line connected to one optical subscriber equipment 4 is turned ON and the others are turned OFF. At the time, when the reflected light from the discontinued point is present, its presence and the position are discriminated. When no reflected light is present, it is clarified that no discontinuity is present on the branched transmission line. Similarly, even when discontinuity is present on more than two branched transmission lines and when the plural optical subscriber equipments 4 are arranged in an equal distance from a star coupler 2, the respective branched transmission lines are separately measured and the position of the fault point is discriminated. |
