| http://www.w3.org/ns/prov#value | - Further, the change of the refractive index is performed not on the preform but on the fiber so that the optical fiber can be fabricated easily even with a structure where the change in the cross-sectional distribution of refractive index along the fiber axis is steep. [0043] Alternatively, the method of making an optical fiber according to the present invention is a method for making an optical f
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