Several common pump coupling technologies were introduced in this paper. A pulsed fiber laser with repetition frequency of 10 kHz, output power of 24.59 W, single pulse energy of 2.459 mJ and peak power of 10 kW was constructed with GTWave side pumped coupling technology by using the prepared 25/250 GTWave optical fibers. Moreover, a method for further increasing the single pulse energy of the output pulse by using this optical fiber is analyzed. The results show that the fiber can achieve very high single pulse energy output.