| http://www.w3.org/ns/prov#value | - an optical fiber including a core and a clad; a lens mounted on an end face of the core at an end face of the optical fiber; the lens being formed so that the maximum width d4 of the maximum cross section S2 of the lens is greater than the maximum width d3 of the end face of the core, where the maximum cross section S2 is the cross section of the lens cut by a plane that is parallel with the end f
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