对由不同长度的掺铒光纤、不同分光比的耦合器构成的光纤环形腔激光器的输出特性进行了实验研究。通过理论与实验分析， 得出了激光器的输出功率、斜率效率与掺铒光纤的长度、耦合器的分光比有关， 而且存在最佳值的结论。 The output characteristics of a fiber ring cavity laser made up of couplers with different lengths of erbium-doped fibers and different splitting ratios were experimentally studied. Through theoretical and experimental analysis, the output power of the laser is obtained. The slope efficiency is related to the length of the erbium-doped fiber and the splitting ratio of the coupler, and there is an optimal value.