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In order to create guiding conditions within an optical fiber, the refractive index of the core must be higher than that of the surrounding cladding. Standard fibers typically use a central germanosilicate doped core (Silica doped with Germania) surrounded by a pure silica cladding region. In the case of a pure silica core fiber, however, the surrounding cladding is doped with fluorine, which acts to reduce the cladding index with respect to the pure silica.

Without germanium, pure silica core fibers are a lot less sensitive to radiation induced attenuation (RIA) and less susceptible to hydrogen ingression. While a lot less photo-sensitive than their germanium doped counterparts, FBGs can still be inscribed via femtosecond lasers.

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