中文摘要：

提出并实验研究了一种2μm波段全光纤间隔可调双波长光纤激光器.该激光器采用传统的环形腔设计,以最大输出功率33dBm的1 565nm光纤激光器为泵浦源,4m单模掺铥光纤为增益介质,腔内为嵌入多模干涉滤波器的Sagnac环的复合滤波结构.该复合滤波器可实现间隔可调谐,高边模抑制比的双波长激光信号输出.通过泵浦功率的控制和对复合滤波器中偏振控制器的调节,实现双波长3nm到80nm间隔可调的激光输出,边模抑制比为60dB,线宽为0.2nm,功率稳定度为±1.5dB/h,双峰能量差小于4dB.

英文摘要：

A dual-wavelength tunable spacing all fiber thulium-doped laser is reported and demonstrated.The conventional ring cavity is used in this fiber laser,1 565 nm pump source can achieve maximum output power 33 dBm,and a segment of 4mlong single mode thulium-doped fiber is gain medium.The filter is a composite structure based on multimode interference effect and Sagnac ring.Through the composite filter,it can radiate tunable spacing and high side mode suppression ratiodual-wavelength laser output.The experimental results suggest that not only dual-wavelength tunable spacing from 3nm to 80 nm,but also SMSR is 60 dB under the controlling of pump power and polarization controller in composite filter,line-width is 0.2nm,power fluctuation is ±1.5dB/h,bimodal energy difference is less than 4dBm.