Abstract
Phosphorus doping to SiO 2 -GeO 2 core glass in optical fiber raised hydrogen and radiation induced-loss increases. The precursor of germanium electron center ( Ġe ) and phosphorus associated center ( . P ) produced with the phosphorus doping was found to be origin of the raised induced-losses. Silicon associated defect (Sidbnd;) generated from peroxy linkage during drawing process in optical fiber seemed to react with hydrogen to produce silylidyne group with absorption peak at 1.52 μ m.
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