By incorporating double-ring cavities and a piece of un-pumped Er³⁺-doped fiber (EDF) as a saturable absorber, we report a single-longitude-mode EDF fiber laser at C-band. The single-longitude-mode is obtained, the first time, by inserting only two subring cavities in either serial connection or parallel connection. The fiber laser has an optical signal-to-noise-ratio of 34.5 dB and a maximum power fluctuation of less than 1.3% for 1-hr operation. It was then modulated up to 10 Gbit/s by using an electro-optic modulator for eye diagrams, compared to back-to-back transmission. Such a compact and low-cost fiber laser is potential for high-speed optical communication.

通过结合双环腔和一条未泵浦的掺Er ^3+的光纤（EDF）作为可饱和吸收体，我们报告了C波段的单经度EDF光纤激光器。通过在串行连接或并行连接中仅插入两个子环腔，首次获得单经度模式。光纤激光器的光信噪比为34.5 dB，1小时工作时最大功率波动小于1.3％。然后，与背对背传输相比，通过使用电光调制器进行眼图调制，可以将其调制速度提高到10 Gbit / s。这种紧凑且低成本的光纤激光器对于高速光通信具有潜力。