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Lett."],"published-print":{"date-parts":[[2026,9,15]]},"abstract":"<jats:p>Sources of photon pairs based on spontaneous four-wave mixing in silica fibers are generally considered limited by the spectrally broad spontaneous Raman scattering noise. I experimentally show that fluorescence from native or residual doping defects in silica fibers can become preponderant in situations where Raman scattering is normally eliminated, revealing a new, to the best of my knowledge, source of noise in silica-fiber-based sources of pairs of photons. 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