Investigations of interstitial Bi0 interacting with intrinsic defects in bismuth-doped silica optical fiber

Abstract

The interaction mechanisms of interstitial Bi0 with intrinsic defects in bismuth-doped silica optical fiber are investigated by first-principles calculations. The results reveal that interstitial Bi0 easily interact with peroxygen defects and the reaction products are more stable. By analyzing the effective charges of the reaction products of interstitial Bi0 interacting with peroxy linkage (POL), non-bridging oxygen hole center with silicon dangling bond (NBOHC-Eʹ), and peroxy radicals with silicon dangling bond (POR-Eʹ), it finds that Bi atom is nearly divalent. For interstitial Bi0 interacting with oxygen deficiency center (ODC(I)), it forms a complex with two Si atoms in the defect. The method will be effective to understand interaction mechanism of interstitial Bi0 with intrinsic defects in bismuth-doped silica optical fiber.