| http://www.w3.org/ns/prov#value | - Another aspect of the present invention relates to an optical fiber for the propagation of an optical signal having a wavelength, the optical fiber including a core surrounded by a cladding layer, the cladding layer having an average refractive index nc, the core including a central region having a radius r1, a maximum delta ??1 of between about 0.4% and about 1.5%, a refractive index ??-profile h
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