基于光纤双锥滤波的波长可调谐掺铒光纤激光器  

Wavelength Tunable Erbium-doped Fiber Laser Based on All-fiber Dual-taper Filter

作　　者：董政洁 孙蓉 孙明星 Dong Zhengjie;Sun Rong;Sun Mingxing(Luoyang Bureau of Quality and Technical Supervision,Luoyang Henaii 471003,China)

机构地区：[1]洛阳市质量计量检验测试中心,河南洛阳471003

出　　处：《科技通报》2022年第3期42-46,51,共6页Bulletin of Science and Technology

基　　金：华北水利水电大学高校横向课题项目(51116)。

摘　　要：针对波长可调谐掺铒光纤激光器系统结构复杂的问题,本文提出并设计了一种基于光纤双锥干涉滤波结构的波长可调谐窄线宽掺铒光纤激光器,实现了激光波长灵活可调谐输出。采用单模光纤与多模光纤拉锥技术制备全光纤SMS(single-multi-single)干涉结构,并将SMS滤波器插入环形腔掺铒光纤激光器谐振腔中作为调制单元。实验中所制备的SMS滤波器干涉周期为0.67 nm,激光器工作阈值为67 mW。泵浦功率为120 mW时,通过调整激光器谐振腔内损耗,在1567.37~1574.69 nm光谱范围内实现了单波长激光可调谐输出,激光边模抑制比高于24.83 dB,3 dB线宽小于0.22 nm,最高功率差值低于2.04 dB;通过调节偏振控制器,所设计激光器能够实现双波长激光可切换输出,输出激光波长间隔小于1.32 nm, 3 dB线宽小于0.23 nm;实验中对1574.07 nm单波长激光输出稳定性进行了测试,在25 min测试时间内,没有出现模式跳变,功率漂移小于0.16 dB。结果表明所设计的光纤激光器具有较好的波长调谐能力及稳定性。Based on the complex structure of wavelength tunable erbium-doped fiber laser system, an L-band wavelength tunable narrow linewidth erbium-doped fiber laser incorporating with fiber SMS(Single-Multi-Single) interference filter structure was proposed and wavelength tunable lasers output was demonstrated experimentally. All fiber SMS interference structure was fabricated by single-mode and multi-mode fiber taper method, and the SMS filter was inserted into the erbium-doped fiber laser cavity as the modulation unit. For the proposed fiber laser, the interference period of the SMS filter was 0.67 nm and the laser threshold was 67 mW. When the pump power was 120 mW, the tunable single wavelength laser during 1567.37 ~ 1574.69 nm scope was realized by adjusting the laser resonator loss. The side mode suppression ratio of laser was higher than 24.83 dB, the linewidth of 3 dB was less than 0.22 nm, and the maximum power difference was lower than 2.04 dB. By adjusting the polarization controller, switchable output of dual-wavelength lasers were realized, wavelength space was less than 1.32 nm and 3 dB linewidth was less than 0.23 nm. In the experiment, the single-wavelength laser stability of 1574.07 nm laser was tested during 25 minutes respectively, there was no obvious mode hopping, and the power drift was less than 0.16 dB. The results show that the designed fiber laser has better wavelength tuning ability and stability.

关 键 词：光纤激光器 掺铒光纤 SMS干涉 光纤拉锥 

分 类 号：TN253[电子电信—物理电子学]