| http://www.w3.org/ns/prov#value | - Since the viscosity of the preform is low when it is bored, the energy required for boring can be reduced and thin and deep voids with uniform diameter can be easily formed so that the yields of the obtained optical fiber can be enhanced. [0041] Alternatively, the method of making an optical fiber according to the present invention is a method of making an optical fiber which contains a plurality
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