耦合反馈激光混沌振幅调制全光逻辑门及光电复合逻辑门研究

All-optical and combinational optoelectronic logic gates using chaotic synchronization of coupling-feedback semiconductor lasers and amplitude modulation

理论研究耦合反馈半导体激光器混沌同步及其在光学数字逻辑门中的应用,构建了三种基本的全光XNOR,NOR,NOT门以及光电复合NOR光学数字逻辑门的物理模型,定义了这些逻辑门的计算原理和方法.基本物理方法是,让外部光注入到2个激光器中产生激光混沌输出,通过两激光器激光的相互耦合及反馈实现混沌同步.在此基础上,利用光的外部调制方法让两相互耦合激光分别在振幅调制下控制混沌同步或非同步,实现了全光逻辑门的功能与计算.然后联合激光的外部调制和激光器电流调制,控制混沌同步或者非同步,实现了光电复合逻辑门的功能与计算.另外,详细地数值分析了激光混沌再同步与再非同步对逻辑输出影响等问题,结果证明了该方案的科学合理性与可行性.

Chaotic synchronization of coupling-feedback semiconductor laser diodes is theoretically studied for optical logic gate applications.The constructions of the fundamental all-optical XNOR,NOR,NOT gates and combinatorial optoelectronic logic gate and their physical models are presented.The computational principles and methods are defined for these logic gates.Two laser diodes commonly driven by a monochromatic light beam become chaos.Chaotic synchronization between the two lasers is achieved by coupling-feedback.Based on the system and an external optical modulation method,the all-optical logic gates are performed for digit computation via the amplitude modulator modulating the coupling light to synchronize or un-synchronize two chaotic states.And the combinational optoelectronic logic gate is implemented for digit computation by modulating the amplitude of coupling light and the current to synchronize or un-synchronize two chaotic states.Lastly,the effect of resynchronization and reunsynchronization on logic output was analyzed numerically,in detail.Numerical simulations show the validity and feasibility of the methods.