时间透镜成像系统的数值分析  

Numerical study on the temporal imaging system based time lenses

作　　者：郭淑琴[1] 俞梦杰[1] 

机构地区：[1]浙江工业大学信息工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2015年第1期94-96,118,共4页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(60977020)

摘　　要：在高非线性光纤中利用四波混频(FWM)效应产生时间透镜,由输入色散光纤、时间透镜,以及输出色散光纤三部分构成光信号处理的时间成像系统.时间透镜将泵浦光的二次相位通过四波混频作用传递给信号光,啁啾化的信号光在经过光纤的色散之后可以引起脉宽的放大或压缩.数值计算表明:在时间成像系统中,采用较宽的泵浦光会导致信号光脉宽的放大倍数M值下降,但泵浦光输入功率的强弱对放大因子M值没有影响.考虑到光纤的损耗会导致色散线路上信号功率的衰减,为使色散与非线性效应动态匹配,将输入输出两段光纤的色散由固定值改进为指数渐减,可以使放大倍数更趋近于理论值.Based on four wave mixing effect（FWM effect）in high nonlinear optical fiber,a temporal imaging system is comprise of an initial fiber,time lens,and a final fiber for optical signal proceeding.Pump pulse transfers its quadratic phase to signal pulse through four wave mixing effect,and so chirped signal will be magnified or reduced after suffering proper dispersion in optical fiber.By numerical calculation,it can be seen that the wider pump pulse will induce magnification rate a little smaller than the theoretical value in the temporal imaging system,but pump power has no impact on magnification factor.Because the loss of fiber will attenuate the power of signal in propagating process,so when dispersion parameter is designed according to the exponential decreasing rule,perfect mapping between dispersion and nonlinear make the magnification factor more near to theoretical value.

关 键 词：时间透镜 FWM效应 时间成像系统 放大因子 

分 类 号：O439[机械工程—光学工程]