| 摘要 |
PURPOSE:To provide a stress affording parent material for optical fiber having high quality with small numbers of prepd. stage and with high efficiency by using a vessel provided with specified partitions and utilizing sol-gel process. CONSTITUTION:Sol for forming a core part, stress affording part, and a clad part is prepd. respectively by hydrolyzing a metal alkoxide wherein the sol for forming the stress affording part and the clad part are prepd. to have a compsn. giving a same refractive index after calcination. Then, a vessel 3 with sections 2a, 2b, 2c, and 2d separated by partitions 1a, 1b, and 1c is prepd. and the sol for the clad is contained in the section 2a, the sol for the stress affording part is contained in the section 2b and 2c, and the sol for clad part is contained in the section 2d, and each sol is allowed to stand. Immediately before the sol is coagulated by gelling, each partition 1a, 1b, and 1c is removed and the boundary is combined to form one body. Obtd. gel is then dried, melted and vitrified. |
