| 摘要 |
PROBLEM TO BE SOLVED: To provide a porous capillary that has a plurality of vacancies into which optical fibers are inserted, respectively, and can be softened uniformly as a whole.SOLUTION: In this porous capillary 11, the plurality of vacancies 13 into which the optical fibers 12 are inserted, respectively, are formed in a glass-made member, and the softening temperature of the glass-made member is lower on the inner side of the radial direction of the glass-made member. |
