| http://www.w3.org/ns/prov#value | - According to this feature, it is possible to realize low loss characteristics in an optical fiber having ring-shaped refractive index profile. [0021] A second aspect of the present invention is an optical fiber wherein the core contains more than three layers of which refractive indexes are different. [0022] A third aspect of the present invention is an optical fiber wherein refractive index of a
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