随着互联网的发展, 网络数据流量极速增长, 全光网(AON)概念的提出有利于解决可用带宽受限、信号传输速率较低等问题。其中, 全光逻辑信号处理为AON的重要组成部分。根据周期性极化铌酸锂(PPLN)波导的二阶非线性效应原理, 将产生的输出信号连续送入不同的PPLN波导进行叠加处理, 设计出全光2线-4线译码器的波导级联结构, 通过数值计算仿真得到了波形图和眼图, 分析了全光2线-4线译码器输出信号的半高全宽(FWHM)、峰值功率、延迟时间和消光比。仿真结果表明: 采用PPLN波导级联的方式实现了2线-4线译码器在光域中的逻辑功能, 同时保证了光信号的传输质量, 为PPLN波导的全光信号处理提供了新的器件类型。

With the development of the internet, network data traffic is increasing rapidly, the concept of all-optical network (AON) is helpful to solve the problems of limited available bandwidth and low signal transmission rate. Among them, all-optical logic signal processing is an important part of AON. According to the principle of second order nonlinear effect of periodically poled lithium niobate(PPLN) waveguide, the output signal is successively sent to different PPLN waveguides for superposition processing, and the waveguide cascade structure of all-optical 2-4 line decoder is designed. The waveforms and eye diagrams are obtained by numerical calculation and simulation, and the full width half maximum (FWHM), peak power, delay time, extinction ratio of the output signal of all-optical 2-4 line decoder are analyzed. The results show that the logic function of 2-4 line decoder in optical domain is realized by cascading PPLN waveguides, and the transmission quality of optical signal is guaranteed, which provides a new device type for all-optical signal processing of PPLN waveguide.