非对称非线性定向耦合器开关特性研究  

Switching Characteristics of Asymmetric Nonlinear Directional Couplers

作　　者：李齐良[1] 张爱辛[1] 华晓锋[1] 曾然[1] 

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018

出　　处：《电子器件》2011年第4期432-434,共3页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(10904028);浙江省自然科学基金项目(Y1110078)

摘　　要：利用拉格朗日变分法原理,分析了非对称非线性定向耦合器的开关特性。研究表明:增大第一纤芯的相速度能够降低开关的阈值功率,但开关的陡峭性变差,且当相位失配量增大到一定程度,输入低功率脉冲时,光脉冲的部分能量将一直保持在直通纤芯臂内不能耦合到第二纤芯。增大第一纤芯的有效模场面积将导致开关的阈值增大。同时,当两纤芯都为反常色散光纤时,色散特性差异增大可以在保持开关陡峭性基本不变的情况下减小开关的阈值功率,但当第一纤芯为反常色散光纤,第二纤芯为正常色散光纤时,开关的阈值将比对称情况下开关的阈值功率高。We use the Lagrange variational approach to study the switching characteristics of asymmetric nonlinear directional couplers. The study shows that, the increase of phase velocity of the first core lead to decrease of the switch threshold power. However,when the phase mismatch increases to a certain extent, a part of energy of pulse always stay in the first core when the input pulse is of lower power. With the increase of the effective mode field area of the first core, the switch threshold power increases. At the same time, when both of the cores are anomalous dispersion fibers, the increase of differences in the dispersive properties leads to the decrease of switch threshold power. However, when the first core is anomalous dispersion fiber and the second core is normal dispersion fiber, the threshold power increases.

关 键 词：非对称光开关 相位失配 有效模场面积差异 色散特性差异 开关特性 

分 类 号：TN929[电子电信—通信与信息系统]