| 摘要 |
A light fiber comprising (a) a tubular clad having a predetermined length and (b) a solid core formed by reacting a filler material with which the clad is filled, the clad and the core being closely contacted with each other by shrinkage of the clad, characterized in that: the clad is expandable under pressure, shrinkage of the clad is initiated before the completion of the reaction of the filler material and is carried out in conformity with volume reduction of the core, which accompanies the reaction of the filler material, and the number of air gap between the clad and the core, which is measured per length of 10 m, is 3 or less.
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