基于弱反射FBG串的随机分布反馈掺铒光纤激光器  

Weak reflectivity FBG array based random distributed feedback Er-doped fiber laser

作　　者：袁俊伟[1] 董新永[1] 王鹿鹿[1] 朱磊[1] 

机构地区：[1]中国计量学院光电子技术研究所,浙江杭州310018

出　　处：《光电子．激光》2015年第1期20-24,共5页Journal of Optoelectronics·Laser

基　　金：国家"973"计划(2010CB327804);浙江省自然科学基金(Z13F050003);新加坡A*STAR"Advanced Optics in Engineering"(1223600006)资助项目

摘　　要：提出一种基于弱反射光纤光栅(FBG)串的随机分布反馈掺铒光纤(EDF)激光器。激光器利用1 480nm半导体激光泵浦一段2 m长的高浓度EDF进行增益放大,由弱反射FBG串提供随机分布反馈,具有阈值低、线宽窄、效率高和输出稳定等优点。实验中,在激光器谐振腔的一端用一个反射率为90%的窄带FBG进行波长选择性反射,在另一端连接由20个波长相同、反射率在5‰左右的弱反射FBG组成的FBG串(总反射率为9%)提供随机分布反馈,在最大输出功率为400mW的1 480nm泵浦激光作用下获得了峰值波长为1 549.48nm、阈值功率为3 mW、斜率效率达24%的窄线宽稳定激光输出。在相同泵浦激光功率下,间隔一定时间,多次测量激光输出光谱,证实该随机分布反馈FBG激光器具有良好的波长和功率稳定性。A random distributed feedback erbium-doped fiber （EDF） laser based on weak reflectivity fiber Bragg grating （FBG） array has been proposed and experimentally demonstrated. It contains a 2-m-long high concentration erbium-doped fiber pumped with a 1480 nm laser diode to provide gain and amplification, and an array of weak refleetivity FBGs to achieve random distributed feedback. The laser possesses several important advantages,including low pump threshold, narrow line width, high slope efficiency and stable laser output. In the experiment,an FBG with high refleetivity of 90% is connected to one end of the laser cavity to reflect a narrow band of light,and an FBG array with 20 weak reflectivity FBGs with the same Bragg wavelength and individual and total refledtivities of 5‰ and 9% respectively is connected to the other end of the laser cavity to provide random distributed feedback. By using a 1480 nm pump laser with maximum output power of 400 roW,we successfully achieve a stable and narrow line width laser output whose threshold power is 3 mW, slope efficiency is 24%, and the peak wavelength is 1 549.44 nm. The good laser output stability is tested by multiple repeating measurements of the laser output spectrum under a fixed pump power at a certain time interval.

关 键 词：光纤激光器 随机激光器 弱反射光纤光栅(FBG)串 掺铒光纤(EDF) 

分 类 号：TN248.1[电子电信—物理电子学]