| http://www.w3.org/ns/prov#value | - The present invention is an optical fiber whose base material is silica glass and that has a two layer structure formed by a core that has a substantially uniform refractive index and by a cladding that is located outside the core and that has a substantially uniform refractive index, wherein the optical fiber satisfies the following conditions (1) to (3): (1) an outer diameter of the core is in a
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