A new type of dual-wavelength photonic crystal fiber laser was proposed and demonstrated, based on superimposed fiber gratings. Linear cavity structure was used to induce the laser, Er3+-doped Photonic Crystal Fiber was used as the gain medium, and two superimposed fiber gratings whose reflectivity were higher than 99% were used for wavelength selection. Based on gain equalization technologies, modal competition in the cavity was suppressed to realize dual-wavelength laser at room temperature. The 3 dB line-wide is less than 0.02 nm, 30 dB line-wide is less than 0.25 nm, and SMSR is 54.34 dB. The wavelength interval of dual-wavelength laser is 0.932 nm. The experimental result show that the wavelength and the laser energy of the dual-wavelength laser are stable.

提出了一种基于光纤重叠光栅的双波长光子晶体光纤激光器。激光器采用线形腔结构,掺铒光子晶体光纤为激光器的增益介质,反射率均高于99%的光纤重叠光栅用作激光器的波长选择器件。基于增益均衡技术,抑制谐振腔内的模式竞争,在室温下获得了稳定的双波长激光同时输出。实验结果表明: 其3 dB线宽小于0.02 nm,30 dB线宽小于0.25 nm,SMSR为54.34 dB,双波长激光的中心波长间隔为0.932 nm。该双波长激光器输出的双波长激光具有较好的稳定性。