3级串联声光可调谐滤波器旁瓣抑制的研究  

Suppression of sidelobe levels for acousto-optic tunable filters using cascaded three single-stage AOTFs

作　　者：杨薇[1] 刘迎[1] 肖立峰[1] 杨兆祥[1] 

机构地区：[1]天津大学理学院物理系,光电信息技术科学教育部重点实验室,天津300072

出　　处：《光电子．激光》2009年第4期436-439,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60478036)

摘　　要：利用3级滤波结构,实现了对声光可调谐滤波器(AOTF)的旁瓣抑制。根据耦合模理论分析了共线型和准共线型AOTF的滤波原理,推导出3级级联滤波的转换特性表达式:计算结果表明,3级滤波结构能够有效地抑制旁瓣。实验测定表明,旁瓣被抑制到-27dB左右,并且滤波带宽也得到了压窄。The large sidelobes higher than -9 dB of the single-stage acousto-optic tunable filter(AOTF) may limit the application.In order to suppress sidelobes further,a triple-stage AOTF is stuied.The theory of single-stage collinear and quasi-collinear AOTFs is analysed,and then the transfer function of the triple-stage filter is obtained.The calculated results demonstrate that the triple-stage device can provide significant improvement in sidelobe suppression;Experimental measurement shows that sidelobes are suppr...

关 键 词：集成光学 声光滤波器 可调谐滤波器 声光耦合 波分复用(WDM) 

分 类 号：TN713[电子电信—电路与系统]