基于PPLN波导的全光数据选择器的设计与研究

Design and Investigation of All-Optical Data Selector Based on PPLN Waveguides

在高速的光通信网络中,现有的光网络交换能力与传输能力相比严重失衡,建立全光网络(AON)成为解决该问题的一种有效途径。但是由于全光逻辑器件的不完善,使得全光分组交换技术无法达到实用阶段。基于周期性极化铌酸锂(PPLN)波导的和频+差频效应(SFG+DFG),在准相位匹配条件下,采用波导级联的方式设计并实现了全光2选1数据选择器。通过数值计算和仿真得到波形图和眼图,并利用脉冲宽度、消光比以及峰值功率延迟时间等参数分析数据选择器的性能。结果表明,采用PPLN波导级联的方法对信号光进行处理,不仅可以完成相应的逻辑功能,而且可以保证信号的传输质量,还扩展了PPLN波导在全光逻辑信号处理方面的能力。

In the high-speed optical communication network, the present optical network switching capability and transmission capability are seriously unbalanced. Therefore, building all-optical network （AON） is an effective way to solve the problem. However, all-optical packet switching technology has not been achieved due to immature all- optical logic devices. The all-optical 2-to-1 data selector is proposed based on sum-frequency generation SFGq-DFG and difference-frequency generation （SFG＋DFG） in quasi-phase-matched cascaded periodically poled lithium niobate （PPLN） waveguides. The waveforms and the eye diagrams are obtained by numerical calculation and simulation, and the performance of the data selector is analyzed by the parameters such as pulse width, extinction ratio and peak power delay time. The results show that the signal light is processed using the PPLN waveguide cascade method. It can not only complete the corresponding logic function, but also can guarantee the transmission quality of the signal, which expands the capability of PPLN waveguide on the all-optical logic signal processing.