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Nanosecond pulse generation is demonstrated in a mode-locked erbium-doped fiber laser (EDFL) utilizing a samarium oxide (Sm2O3) film.The Sm2O3 film exhibits a modulation depth of 33％,which is suitable for modelocking operation.The passively pulsed EDFL operates stably at 1569.8 nm within a pumping power from 109 to 146mW.The train of generated output pulses has a pulse width of 356nm repeated at a fundamental frequency of 0.97MHz.The average output power of 3.91 mW is obtained at a pump power of 146mW,corresponding to 4.0nJ pulse energy.The experimental result indicates that the proposed Sm2O3 saturable absorber is viable for the construction of a flexible and reliably stable mode-locked pulsed fiber laser operating in the 1.5 μm region.