all solid-state pbs quantum dot (qd)-doped glass precursor fibers avoidingcrystallizationduring fiber-drawing process are successfully fabricated by melt-in-tubetechnique.by subsequent heat treatment schedule, controllable crystallization ofpbs qdscan be obtained in the glass precursor fibers, contributing to broad near-infraredemissionsfrom pbs qd-doped glass fibers. nevertheless, we find that element-migrationandvolatilization of sulfur simultaneously happen during the whole fiber-drawingprocess,because of the huge difference between the melting temperature of core glassandthe fiber-drawing temperature. element-migration pathways along the fiber lengthwererevealed. such pbs qd-doped glass fiber with broadband emissions will be a potentialapplicationas gain medium of broadband fiber amplifiers and fiber lasers. © 2017 optical society of america.