| 摘要 |
PURPOSE:To obtain multiple optical fibers having excellent radiation resistance by welding and bundling many optical fibers formed by providing quartz glass clad layers contg. B and F dopants on cores of high-purity quartz glass manufactured by an oxygen plasma method and contg. an OH group at a lower rate to each other. CONSTITUTION:Many pieces of the optical fibers 2 each formed by providing the clad layer 4 consisting of the quartz glass tube doped with the B and F dopants on the inside circumference thereof by using, for example, BF3, BCl3, SiF4, etc. on the outside circumference of the core 3 of the high-purity quartz glass formed by the oxygen plasma method and contg. 10-300ppm OH group and having 5-30mu core diameter and 1.5-10mu thickness T1 of the layers 4 are welded to each other and are bundled in this state, by which the multiple optical fibers 1 are obtd. The multiple optical fibers which are suitable for an image guide, obviates the increase in transmission loss, etc. by the effect of radiations and have excellent durability for nuclear reactor facilities, etc. are thus obtd. |
