双泵浦功率比实现参量控制减小SBS慢光脉冲失真的研究  

Research on Parametric Control Pulse Distortion through Double Broadband Pump Power Ratio of Stimulated Brillouin Scattering Slow Light in Fibers

作　　者：邱巍[1] 高波[2] 林鹏[2] 李佳[1] 周婧婷[1] 蒋秋莉[1] 马英驰[1] 

机构地区：[1]辽宁大学物理学院,辽宁沈阳110036 [2]中国科学院低温工程学重点实验室(理化技术研究所),北京100190

出　　处：《辽宁大学学报（自然科学版）》2014年第4期318-323,共6页Journal of Liaoning University：Natural Sciences Edition

基　　金：中国科学院低温工程学重点实验室开放课题资助(CRYO201321)

摘　　要：基于单模光纤中SBS慢光特性,通过控制双宽带泵浦光功率比实现参量控制脉冲失真.利用较强泵浦光增益谱的中心频率与较弱泵浦光损耗谱的中心频率相重合,调节较弱泵浦光的功率和谱宽,能够部分地抵消掉较强增益谱的顶部从而构建出平坦的增益谱.研究表明：通过控制双泵浦功率比q,讨论q对相关参量（Wflat、Re[g（ω）]、Im[g（ω）]、ΔTd和ΔTd/Tin等）的影响,可得到功率比q的选取在2.0~3.5区间,使脉冲各参量达到最佳优化状态的结论.同时进一步讨论增益引起的脉冲展宽Bgain,群速度引起的脉冲展宽BG VD和三阶色散,均导致脉冲图像发生扭曲、变形,经研究表明三阶色散是导致的脉冲失真的主要因素.Based on SBS slowlight characteristics in single-mode optical fiber,we research on the parametric control pulse distortion through the double broadband pump power ratio. Using the overlap between the strong center frequency of pump gain spectrum and the center frequency of weak pump loss spectra,we adjust the power and spectral width of weak pump,so the top of the gain spectrum partly can be offset and construct a flat gain spectrum. The results showthat relevant parameters（ such as： Wflat,Re[g（ ω） ],Im[g（ ω） ],ΔTd,ΔTd/ Tin） is optimal under the power ratio of 2. 5 ~ 3. 5. Moreover,pulse image are distorted by pulses broadening,which are caused by gain and the group velocity,and the influence of the third-order dispersion. The third-order dispersion is the main factor for pulse distortion.

关 键 词：色散 脉冲展宽 脉冲失真 

分 类 号：O436.1[机械工程—光学工程]