| 摘要 |
PURPOSE:To reduce a welding joint to the same degree as the outside diameter as a connecting cable, and also to make it excellent in its workability and joint reliability, by containing an uncovered line of an optical fiber, which has been generated by following a welding work, in a grooved spacer which can be attached and detached to and from the outside periphery of an inside fixed cylinder of a split type. CONSTITUTION:Multicore optical fiber cables 22 which have been opposed to each other are melted and coupled by peeling off covering of a protective sheath and laying bare an optical fiber 3 in order to execute fusion welding of the optical fiber 3, and by a discharge arc heat of an arc welding machine in a state that the respective end faces have been butted. Subsequently, a tension member 4 is joined to each other by an expansion joint 18, and an inside fixed cylinder 10 of a split type to which a grooved spacer 19 has been installed is inserted between the optical fiber 3 and the tension member 4. Each optical fiber 3 is selected in advance in accordance with its deflection quantity, and inserted into a containing groove of the prescribed grooved spacer 19 which has been installed to he inside fixed cylinder 10. When all the optical fibers 3 have been inserted completely into the groove of the inside fixed cylinder 10, its periphery is protected by winding a glass tape 8, and in the end, a protective sleeve 9 having a heat contractibility is installed. |
