脉冲沿不同方向入射时的脉冲俘获现象研究  

A research of the pulse trapping characteristics along the direction of incidence

作　　者：张晓娟[1,2] 

机构地区：[1]西北工业大学理学院,陕西省光信息技术重点实验室、教育部空间应用物理与化学重点实验室,陕西西安710129 [2]渭南师范学院数理学院,陕西渭南714099

出　　处：《云南大学学报（自然科学版）》2018年第1期82-87,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：陕西省科技厅项目(2016JQ6031);西北工业大学实验室开放基金(OIT201602);陕西省教育厅项目(17JS042);渭南师范学院校级项目(14YKF004,15ZRRC09,16YKS014).

摘　　要：数值模拟分析了泵浦脉冲和信号脉冲分别沿快轴和慢轴入射到一种高双折射光子晶体光纤时,泵浦脉冲入射条件对脉冲俘获效应的影响.结果表明:选择合适的时域中心延迟可以得到最佳的脉冲俘获效果;增加泵浦脉冲的峰值功率,泵浦脉冲红移量和信号脉冲蓝移量增加,但功率增加到一定程度,信号脉冲输出频谱很窄,不容易实现脉冲俘获;增加泵浦脉冲半宽度,信号脉冲输出频谱强度越来越小,俘获效果变差;泵浦脉冲中心波长的选择直接影响信号脉冲和泵浦脉冲的群速度差,如果波长的改变导致群速度差变大,则脉冲俘获效果变差,甚至消失.A theoretical investigation of the pulse trapping has been analyzed and different incidence conditions have been discussed when the two pulses are polarized along the fast axis and slow axis, respectively.The numerical simulation results show that the optimal pulse trapping effect can be obtained by choosing the appropriate time domain center delay.The red shift of the pump pulse and the blue shift of the signal pulse are larger when the peak power of the pump pulse increases.But it is difficult to achieve pulse trapping when the power increases to a certain extent.With the increase of pump pulse half-width,the signal pulse output spectrum intensity be- comes smaller and the pulse trapping becomes worse.If the change of wavelength leads to a large group velocity difference, the pulse trapping effect decreases, or even disappears.

关 键 词：光子晶体光纤 高双折射 脉冲俘获 泵浦条件 

分 类 号：TN253[电子电信—物理电子学] TN929.11