To meet the pre-stage light source requirement for a distributed fiber Raman temperature sensor (RDTS), an all-fiber pulsed laser with a central wavelength of 1550 nm is developed based on the main oscillator power amplification (MOPA) technology. The laser's fiber amplifier is a two-stage structure with a forward pumping mode. The fiber pulse laser has a peak power output in the adjustable range of 0-10 W, linewidth of 0.32 nm, signal-to-noise ratio of above 25 dB, and adjustable output pulse width and frequency. An experimental temperature measurement is conducted based on Raman scattering for 2 km using a self-made fiber laser. Measurement results show that the temperature demodulation accuracy is less than ±1 ℃, and the shortest temperature measurement period reaches 1.31 s. Experimental results prove that the self-made fiber laser satisfies the requirements of actual applications.