基于PPLN波导的全光4线-2线优先编码器  

All-optical 4-2 priority encoder based on PPLN waveguides

作　　者：童艳 李晶晶[1] 李丹[1] TONG Yan;LI Jing-jing;LI Dan(Department of Information and Control Engineering, Shenyang Urban Con st ruction University, Shenyang 110167,China)

机构地区：[1]沈阳城市建设学院信息与控制工程系,辽宁沈阳110167

出　　处：《光电子．激光》2019年第2期117-122,共6页Journal of Optoelectronics·Laser

基　　金：沈阳城市建设学院科学研究发展基金项目(基于PPLN波导的全光逻辑信号处理方案的研究;XKJ2018005)资助项目

摘　　要：全光网要在光域上实现信息的传输以及路由的交换,需要依靠全光逻辑器件来完成。但是由于已实现的全光逻辑器件功能较为单一,使得全光分组交换技术无法达到实用阶段。为开拓新的全光逻辑运算功能,在PPLN波导的和频+差频效应(SFG+DFG)基础上,提出了全光4线-2线优先编码器设计方案。首先根据PPLN波导的全光逻辑运算原理,分析4线-2线优先编码器的逻辑表达式,然后利用一个PPLN波导实现4线-2线优先编码器的高位输出,利用两个PPLN波导级联实现4线-2线优先编码器的低位输出。通过数值仿真得到信号波形和眼图,计算了消光比、脉冲宽度、半高全宽和峰值功率延迟时间,分析结果表明,本方案能在光域实现4线-2线优先编码器的逻辑功能,且输出信号质量较好,扩展了PPLN波导在全光逻辑信号处理方面的能力。All optical network(AON) needs to rely on all optical logic devices to realize the transmission of information and the exchange of routing.However,all-optical packet switching technology has not been achieved due to immature all-optical logic devices.The all-optical 4-2 priority encoder is proposed based on sum-frequency generation and difference-frequency generation(SFG+DFG) of periodically poled lithium niobate(PPLN) waveguide to expand new all-optical logic operations.Firstly,the logic expressions of the 4-2 priority encoder are analyzed according to the principle of all-optical logic operation based on PPLN waveguide.The high output of the 4-2 priority encoder is obtained by using a single PPLN waveguide,and the low output of the 4-2 priority encoder is obtained by using two cascaded PPLN waveguides.The waveforms and the eye diagrams are obtained by numerical simulation,and the performance of the 4-2 priority encoder is analyzed by the parameters,such as extinction ratio,pulse width,full width half maximum(FWHM) and peak power delay time.The results show that the logic function of 4-2 priority encoder can be achieved in optical domain by this configuration which can guarantee the quality of the output signals and expand the capability of PPLN waveguide on the all-optical logic signal processing.

关 键 词：全光信号处理 全光4线-2线优先编码器 级联PPLN波导 和频效应 差频效应 

分 类 号：TN911.74[电子电信—通信与信息系统]