光纤声光互作用耦合波方程  

Coupled-wave Equations of Fiber Acousto-optic Interaction

作　　者：俞宽新[1] 李胜明[1] 刘韬[1] 田江波[1] 

机构地区：[1]北京工业大学应用数理学院,北京100022

出　　处：《北京工业大学学报》2007年第6期669-672,共4页Journal of Beijing University of Technology

基　　金：国家自然科学基金(60077017);北京市教育委员会基金(01KJ-022).

摘　　要：从参量互作用基本方程出发,导出微扰形式的光纤耦合模方程;视超声波为微扰,推导出光纤声光互作用耦合波方程组,它包括前向波和后向波两个方程．通过求解耦合波方程组,得到后向波效率计算公式,并证明在弱声光互作用的条件下,后向波的光强与超声波功率近似成正比．该研究为光纤声光强度调制器的研制打下了理论基础,这种新型调制器将在光纤通信领域中有广泛的应用前景．A fiber coupled-mode equation with perturbation is given from basic equation of the parameter interaction. Considering ultrasonic wave as perturbation, a coupled-wave equation group of fiber acousto-optic interaction is deduced. This equation group includes equations of forward wave and backward wave. The equation group is a theory base of fiber acousto-optic effect. Through solving the equation group, a formula of backward wave efficiency is obtained. It is proved that under condition of weak acousto-optic interaction, the intensity of the backward wave is directly proportional to acoustic power approximately. The research in this paper will lay theoretical foundation on manufacture of the fiber acousto-optic intensity modulator. The new modulator can be widely applied to optical fiber communication.

关 键 词：光纤 声光效应 声光调制 耦合波方程 

分 类 号：TN65[电子电信—电路与系统]