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A single-mode laser is demonstrated using a newly developed double-clad thulium-ytterbium-doped fiber (TYDF) in a linear cavity formed by two fiber Bragg gratings (FBGs). The YTF used is drawn from a D-shape preform fabricated using the modified chemical vapor deposition and solution doping technique. The laser is operated at 1 901.6 nm via the transition of thulium ions from 3 F4 to 3 H6 with the assistance of ytterbium to thulium ion energy transfer. The efficiencies of the laser are 0.71%doi:10.3788/col201210.101401 fatcat:dpdf76pxtrfjvndbcbedm5coau