| 摘要 |
PURPOSE:To keep the mechanical strength for a long time, by subjecting the connceting part, where a pair of optical fiber end parts are butted to each other and are melt-stuck to the surface treatment with a corrosive solution which dissolves optical fibers and coating and protecting the connecting part just after washing and heating it. CONSTITUTION:Optical fibers 1A and 1B have coating layers eliminated from end parts 2A and 2B and are butted and are melt-stuck to each other by arc discharge or the like to form a melt-stuck connecting part 5. A corrosive solution 6 such as a fluoric acid which dissolves optical fibers is stored in a liquid bath 7, and the connecting part 5 between optical fibers 1A and 1B is immersed in the liquid bath 7 to subject the connecting part 5 to a required reinforcing treatment. After strength degrading factors of the connecting part 5 are eliminated in this manner, the connecting part 5 is taken out from the liquid bath 7 and is washed. The connecting part 5 is heated through an electric heater and has residual corrosible components volatilized. The connecting part 5 just after the heat treatment is coated with a silicone resin or the like to form a coating layer 8. |
