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A highly Tm-doped lead germanate glass fiber is developed using the rod-in-tube method. The ∼2 μm laser beam quality of the fiber is ∼1.5. The lead germanate composite fiber jumpers are homemade for all the fiber laser investigations. When core is pumped by a 1590 nm Yb/Er fiber laser, a maximum laser output of 313 mW is achieved at a 670 mW pump power, and the corresponding slope efficiency is ∼52.8%. Moreover, by using a 2 cmlong lead germanate fiber as the gain medium, a 33 mW 1942 nm Tmdoi:10.3788/col201614.081601 fatcat:xgsj3kpguzf2hfwz3lg6nvjggi