搭建了以掺镱光纤作为增益、单模光纤提供随机分布反馈的随机光纤激光器，最大输出功率为5.1 W，半峰全宽(FWHM)为0.34 nm。以该激光器作为种子源，通过全光纤主振荡功率放大实现了1102 W的激光功率输出，光光效率为78.5%。放大过程中输出激光的FWHM基本保持不变，均方根(RMS)谱宽为1.24 nm。为进一步压缩随机光纤种子源的光谱线宽，利用窄谱光纤光栅对随机光纤种子源进行滤波，然后再进行放大，最大输出功率为1093 W，FWHM为0.61 nm，均方根谱宽为0.92 nm。放大过程中未观察到明显的放大自发辐射与受激布里渊散射现象。

The random fiber laser is established with Yb-doped fiber as gain and single-mode fiber as the random distributed feedback, The maximum output power is 5.1 W and the full width at half maximum (FWHM) is 0.34 nm. The high power laser is realized by employing a main oscillator power amplifier configuration, seeded by the random fiber laser above, whose output power reaches 1102 W with an optical-to-optical efficiency of 78.5%. During the whole amplification process, the laser FWHM is well maintained but the root mean square (RMS) linewidth broadens to 1.24 nm. To suppress the spectral width of the random fiber seed laser, a narrowband fiber Bragg grating is used to filtering the random fiber seed laser, and then to enlarge. The maximum output power reaches 1093 W with FWHM of 0.61 nm and RMS linewidth of 0.92 nm. No amplified spontaneous emission and stimulated Brillouin scattering is observed in the whole amplification process.