中文摘要：

基于增益均衡技术,提出了一种结构简单的双波长光纤激光器。激光器采用线形腔结构,以一对双波长掺铒光纤重叠光栅为波长选择器件,掺铒光纤为增益介质。实验结果表明,通过精细调节输出端双波长掺铒光纤重叠光栅两端的机械应力,能够调整出射端腔镜在λ1和λ2处的反射率（或透射率）,即调整激光器的损耗,使谐振腔内双波长处各自的损耗和增益相匹配,有效抑制腔内模式竞争,实现了波长间隔为0.932 nm的稳定双波长激光同时激射。该激光器阈值功率为4 m W,输出激光的3 d B带宽约为0.02 nm,30 d B带宽小于0.2 nm,边模抑制比可达51.96 d B。激光器具有结构简单、室温下输出稳定、线宽窄、阈值低等优点。

英文摘要：

Based on gain homogeneity technology, a new type of dual-wavelength fiber laser is proposed and demonstrated. Linear cavity structure is used in the fiber laser, two Er3＋-doped superimposed fiber gratings with reflectivity above 99% are used for wavelength selection, and Er3＋-doped fiber is used as the gain medium. The experimental results show that precise adjustment of the mechanical stress at two ends of the superimposed fiber gratings can regulate the reflectivity（or transmissivity） of cavity lenses at the output end at wavelengths of l1 and l2, i.e. regulate the laser loss, which makes the gain and loss at two wavelengths in the resonance cavity match well,inhibits mode competition in the resonance cavity, and achieves stable simultaneous dual-wavelength laser emission with wavelength interval of 0.932 nm. The threshold power of the proposed laser is 4 m W, the 3 d B band width is0.02 nm, the 30 d B band width is less than 0.2 nm, and the side mode suppression ratio is 51.96 d B. This laser has advantages such as simple structure, stable output at room temperature, narrow band width and low threshold.