将主动被动同步法改进后，用于对长延迟状态下电光双稳态系统进行混沌控制和同步研究，分别采用单向驱动方法和驱动耦合方法研究电光双稳态系统的混沌控制和同步。数值模拟表明，在适当参数条件下应用单向驱动方法，驱动系统可以将响应系统控制到各周期状态，且驱动系统的状态决定了响应系统的状态；适当选取耦合系数和驱动强度，两种方案都可以实现驱动系统与响应系统之间的混沌同步。从同步效果上来看，驱动耦合方法所需耦合系数更小，可控的耦合系数范围比较广，同步效果更好。

Chaos control and synchronization in long-delay electrical-optical bistable systems are researched through modified active-passive method. Unidirectional driving method and driving-coupling method are used in the study on chaos control and synchronization, respectively. The results of numerical simulation show that the chaos of driven system is controlled by the driving system through unidirectional driving method. The driven system′s periodic state lies on the driving system′s periodic state. By adjusting the driving intensity and the coupling coefficient, the chaos synchronization is realized between the driven system and the driving system with these two methods. The effects of driving-coupling method are better than those of unidirectional driving method. Driving-coupling method needs less coupling coefficient and has a larger range of effective coupling coefficient.