Silica Glasses and Optical Fibers Prepared by Plasma Chemical Vapor Deposition Using Bromide Precursors

摘要

Silica glasses containing substitutionally incorporated bromine, up to 1.5 wt %, are prepared by plasma chemical vapor deposition from bromide precursors at a pressure on the order of 130 Pa. The absorption spectra of the Br-doped glasses show bands at 215, 248, and 400 nm. In the concentration range studied, the bromine dopant causes no additional losses within the optical-fiber communication windows. In the spectrum of germanosilicate glass prepared from bromides, the absorption band at 1.38 蘭 consists of four Gaussian components, peaked at 1.38, 1.39, 1.42, and 1.43 μm. Single-mode germanosilicate fibers prepared from bromides exhibit enhanced UV sensitivity, which make them potentially attractive for producing devices based on fiber gratings formed by periodic modulation of the refractive index of the fiber core.