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Effect of fluorine and phosphorus on the UV-excited fluorescence in germania-doped silica optical fiber preforms

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Abstract

It is well known that a germania-doped preform core fluoresces strongly when excited by UV radiation. The shape of the fluorescence profile resembles the index profile and has been used to measure the index profile of Ge-doped single-mode preforms.1 However, the resemblance breaks down when other dopants are present.2,3 To investigate the effect of the commonly used dopants, fluorine and phosphorus, on the germania fluorescence we made a special MCVD single-mode preform consisting of four longitudinal sections. In this preform, during the single-core deposition pass, the SiCl4 and GeCl4 flows were kept constant. The POCl3 and Freon flows were turned on/off in a sequence that provided the four possible core dopant combinations along the length of the preform. The resulting preform should, therefore, have the same Ge concentration in each section but different codopants.

© 1986 Optical Society of America

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