Quantum Yield of Bismuth Active Centers Luminescence in Germanosilicate Optical Fibers

The quantum yield (QY) of luminescence of bismuth active centers associated with silica (BAC-Si) in bismuthdoped optical fibers was measured. The luminescence bands peaked at 830 nm and 1400 nm were excited at $800 \mathrm{~nm}, 1240 \mathrm{~nm}$ and 1310 nm. The branching ratio (BR) of radiative transitions at 830 nm and 1400 nm excited at 800 nm was defined. The influence of co-doping with boron on QY and BR is examined.