主振荡功率放大器(MOPA)结构光纤激光相干合成通常被认为需要种子源保持单频输出,而由此引入的非线性效应限制了单链路光纤激光的输出功率。采用宽谱种子源和多波长种子源是抑制非线性效应的有效方式。利用随机并行梯度下降法对三路宽谱光纤放大器和三路多波长光纤放大器相干合成进行了实验研究,取得了理想的相干合成效果。实验结果表明,谱线宽度不是制约MOPA结构相干合成的因素,宽谱放大器和多波长放大器的使用有望使MOPA结构光纤激光相干合成系统获得更高功率的输出。 Main oscillator power amplifier (MOPA) structure Fiber laser coherent synthesis is generally considered to require a seed source to maintain a single frequency output, and the resulting nonlinear effects limit the output power of single-link fiber lasers. Using broad-spectrum seed sources and multi-wavelength seed sources is an effective way to suppress nonlinear effects. The stochastic parallel gradient descent method was used to study the coherent synthesis of three-channel wide-band optical fiber amplifier and three-way multi-wavelength optical fiber amplifier, and an ideal coherent synthesis effect was achieved. Experimental results show that the spectral width is not a factor that restricts the coherent synthesis of MOPA structures. The use of wide-spectrum amplifiers and multi-wavelength amplifiers is expected to achieve higher power output of the MOPA fiber laser coherent combining system.