石墨烯材料由于其优异的电学和光学性质，在被动锁模激光器中作为可饱和吸收体，得到了广泛应用。利用化学气相沉积法高温分解甲烷在铜箔上制得单层石墨烯薄膜，并测量了石墨烯的拉曼光谱。将石墨烯薄膜转移到光纤跳线的氧化锆插芯端面上做成可饱和吸收材料。实验研究了环形腔掺铒光纤脉冲激光器的输出特性，激光器由透射率为92%的光纤布拉格光栅作为输出腔镜，获得了峰值波长为1556.7 nm，3 dB带宽为0.068 nm，重复频率为6.042 MHz，脉冲宽度为58.8 ps的脉冲序列，激光阈值为65 mW。

As an ideal saturable absorber material, graphene has attracted widespread attentions, which can be used as saturable absorber in passive mode-locking lasers because of its perfect electronic and optical characteristics. Single-layer graphene film fabricated on the copper foil by using chemical vapor deposition method. The corresponding Raman spectroscopy is measured. The graphene film is transferred to the facet of zirconium oxide of a fiber jumper. The mode-lock Er3+-doped fiber laser with graphene film as saturable absorber is experimentally studied, which has a ring structure and use a fiber Bragg grating with transmissivity of 92% to select output frequency. The laser has a peak wavelength of 1556.7 nm, 3 dB bandwidth of 0.068 nm, pulse repetition rate of 6.042 MHz and threshold of 65 mW.