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Pure silica core

Pure silica core fibers have no germanium dopants in their cores, fluorine is used instead. Fluorine works as germanium and allows, through the Modified Chemical Vapor Deposition (MCVD) manufacturing technique, the control of NA and cut-off just as germanium would.
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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