提出和展示了一个基于对称非线性光纤环镜的多波长光纤激光器。非线性光纤环镜的强度相关传输能有效地抑制均匀加宽增益介质掺铒光纤中的模式竞争, 从而使光纤激光器在室温下产生稳定的多波长输出, 实验实现了8个波长的多波长激光输出。另一方面, 实验中利用了在线型的双折射光纤滤波器, 它是一种新型的周期性梳状滤波器。实验研究了多波长输出光谱随抽运功率的演化, 结果表明, 抽运功率对多波长光谱的均匀性有较大影响。

A multiwavelength fiber laser with symmetrical nonlinear optical loop mirror, from which up to 8 wavelengths can be generated, has been proposed and demonstrated. The intensity-dependent transmission of nonlinear optical loop mirror due to nonlinear polarization rotation effect is used to alleviate the mode competition in the homogeneous broadening gain medium of erbium-doped fiber. Besides, a novel comb-like filter i.e. birefringence fiber filter is proposed and utilized, which has in-line configuration. At the same time, the effect of the 980 nm pump power on the multiwavelength generation has be investigated. It is shown that the pump power contribute a lot to the evenness of the multiwavelength spectra.