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报道了一种结构简单的波长可调谐掺铒光纤激光器。该光纤激光器由增益平坦型掺铒光纤放大器(EDFA)、偏振相关光隔离器、光纤偏振控制器及输出耦合器组成。利用光纤偏振控制器和偏振相关光隔离器作为波长调谐器件,实现了光纤激光器的波长可调谐输出及双波长输出。利用琼斯矩阵理论分析了光纤激光器腔内不同波长的损耗与偏振控制器状态的关系,指出通过调节光纤偏振控制器,光纤激光器可以实现波长可调谐输出,同时阐述了光纤激光器双波长输出的机制。实验上获得了中心波长在1542~1564nm连续可调,平均功率大于2.6mW,边模抑制比大于35dB的连续激光输出。同时获得了波长为1549nm和1564nm的双波长连续激光输出。
A simple wavelength tunable erbium-doped fiber laser is reported. The fiber laser consists of a gain-flattened erbium-doped fiber amplifier (EDFA), a polarization-dependent optical isolator, a fiber polarization controller and an output coupler. Using the fiber polarization controller and the polarization-dependent optical isolator as the wavelength tuning device, the wavelength tunable output and the dual wavelength output of the fiber laser are realized. Based on the Jones matrix theory, the relationship between the loss of different wavelength of the fiber laser cavity and the state of the polarization controller is analyzed. It is pointed out that the wavelength tunable output can be realized by adjusting the fiber polarization controller and the fiber laser, and the mechanism of the dual wavelength output of the fiber laser is also described. The experimental results show that the continuous laser with center wavelength of 1542 ~ 1564nm, average power of more than 2.6mW and side mode suppression ratio of more than 35dB has been obtained experimentally. At the same time, the dual-wavelength continuous laser output with the wavelength of 1549nm and 1564nm was obtained.