| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a high quality optical fiber from a large base material for optical fiber, including preform drawing, cutting and treatment of end face processes. SOLUTION: A starting core rod is obtained by heat melting to connect a quartz nucleus rod or a dummy rod to the both ends of a glass rod having a part of a core and a clad. Forming a porous glass body by accumulating produced glass minute particles on the periphery of the starting core rod, allowing to obtain a compound raw material, the compound raw material is heated to change into a transparent glass to afford a preform, the preform is stretched, at the lower part of the stretching machine, the abnormal point of the stretched preform is cut to obtain the stretched raw material. The end of the stretched raw material is machined into spindle shape, a dummy rod is joined by melting on one or both ends of the stretched raw material to give a preform for wire drawing, the wire drawing preform is drawn into an optical fiber.</p> |
