| 摘要 |
PURPOSE:To fusion splice the surface-reinforced optical fibers such as a Ti- doped fiber with a low loss by relieving the residual compressive stress of the optical fiber by heat treatment and fusion splicing the fibers by the core direct-vision method. CONSTITUTION:The residual compressive stress on the surface of an optical fiber is relieved, and an accurate optical fiber image (a dark line exhibiting a core is placed at a right position) is obtained. Consequently, the fibers are precisely aligned by utilizing the optical fiber image. A feeble electric discharge is generated under specified conditions. The relation between the frequency of the discharge and the alignment error is shown in the figure, and the relation varies with the kind of the optical fiber and the size of the residual stress. Accordingly, the residual compressive stress is relieved by experimentally selecting the power of the feeble discharge and the time, interval, frequency, etc., of the discharge. |
