| 摘要 |
PURPOSE:To keep the mechanical strength for a long time, by holding a fusion-fixing connection part, where a pair of optical fiber end parts are butted to each other and are fusion-fixed, in a vacious atmosphere for a required time after subjecting this fusion-fixing connection part to the surface treatment with a corrosive solution which dissolves optical fibers. CONSTITUTION:Optical fibers 1A and 1B have coating layers eliminated from end parts 2A and 2B and are butted and are fusion-fixed by arc discharge or the like to form a fusion-fixing connection part 5. A corrosive solution 6 such as a hydrofluoric acid which dissolves optical fibers is stored in a liquid bath 7, and the connection part 5 between optical fibers 1A and 1B is soaked in the liquid bath 7 and is subjected to a required reinforcing treatment. The connection part 5 subjected to the reinforcing treatment is taken out to the outside of the liquid bath 7 and is washed. The connection part 5 is stored in a vacuum chamber 11 of a closed vessel 10 provided with an air suction hole 8 and a heater 9 and is held under a degree of <=1mm.Hg vacuum for a required time. The vacuum chamber 11 is heated through the heater 9 to eliminate moisture and humidity remaining on the surface of the connection part 5. The connection part 5 subjected to the vacuum treatment is coated with a silicone resin or the like. |
