| 摘要 |
PURPOSE:To receive a radiation power efficiently when a propagated light is detected, by giving a flaw on a bending part of an optical fiber whose surface is coated or applying partially a compressive force there to leak a part of the propagated light. CONSTITUTION:When an optical fiber 10 where the surface of a core 10' is coated with a coating body 13 is bent and a flaw 20 which does not reach the core 10' is given to the bending part, light is forcibly reflected from the coating body 13, and a part of a propagated light 14 is leaked, and the radiation power is efficiently received by a photodetector 18. When a partial compressive force is applied to form a recessed part on the bending part, the light is radiated efficiently without influences of an air layer. The radiation power is efficiently received in this manner when the propagated light is detected, thereby obtaining a sufficient detection dynamic range. |
