新型负系数微波光子带通滤波器设计  

Novel Microwave Photonics Band-pass Filter Design with Negative Coefficiect

作　　者：程瑞学[1] 梁晓东[2] 王旭[2] 王芳[2] 

机构地区：[1]新乡市中心医院影像中心,河南新乡453007 [2]河南师范大学物理与信息工程学院,河南新乡453007

出　　处：《河南师范大学学报（自然科学版）》2014年第6期42-46,共5页Journal of Henan Normal University(Natural Science Edition)

基　　金：河南省教育厅科学技术研究重点项目(12A510015)

摘　　要：提出了一种基于偏振调制的负系数带通微波光子滤波器结构,克服了正抽头系数低通滤波的限制,并对所提结构的可行性进行了详细的理论分析和仿真实验验证.系统利用偏振调制器特殊的相位调制特性,通过控制抽头光信号的偏振态,实现了相位调制到强度调制的转换,实现了2抽头的正、负系数带通滤波器.调节PC2和PC3,当上下2路抽头光信号的偏振态方向满足θ1=π-θ2时,实现了负系数带通滤波器;当满足θ1=θ2时,实现的是正抽头的低通滤波器.A novel tunable negative-tap band-pass photonic microwave filter using polarization modulation together with susceptible to polarization components is proposed for overcoming the restrictions that positive tap coefficients can only achieve the low pass filter.We carried on the detailed theoretical analysis and simulation experiments about the feasibility of this structure.The polarization modulator is a special phase modulation that the passed optical signal will suffer from orthogonal and reverse phase direction modulation.The phase modulated signal will change to the intensity modulation by adjust the polarization controllers PC2 and PC3which effect on the polarization of modulated optical signal.A negative coefficient tap microwave photonic band pass filter will be obtained when the polarization of two taps satisfy the expressionθ1=π-θ2,simultaneously,a positive coefficient tap microwave photonic low pass filter realized whenθ1=θ2.

关 键 词：微波光子技术 偏振调制器 负系数滤波器 带通滤波器 

分 类 号：TN253[电子电信—物理电子学]