Fabrication and characterization of solution doped gallium and barium preforms

Using standard MCVD with solution doping technique. The maximum concentrations of dopants that could be incorporated into silica were found to be 1.4 and 3.0 mol% for barium oxide and gallium oxide, respectively. At these concentrations, the final preforms showed reduced transparency in the core region indicating phase separation. Both of these dopants behavior in silica was discussed and compared with aluminum oxide being the typical dopant used in rare earth doped-silica fibers. The alumina-doped preform was observed to show opacity in the core region when the concentration of aluminum oxide was 10 mol%.