基于菲涅耳-基尔霍夫衍射积分理论, 研究了端面泵浦固体激光器中泵浦源--LD阵列光纤耦合模块的输出光空间特性, 及其对振荡光特性的影响。结果显示: LD阵列光纤耦合模块的输出光强分布不平滑, 呈多尖峰分布, 尖峰位置对LD光束指向角敏感, 随指向角、空间排布等因素的变化而变化, 是多种因素综合作用的结果; 具有尖峰结构的泵浦光场对振荡光横模结构有直接影响, 泵浦光尖峰位置越居中, 光强径向分布曲线在轴心处越凸起, 振荡光光束质量越好, 越凹陷, 振荡光光束质量越差, 在激光器设计中应有针对性地具体考虑应对措施。

针对双延时和三延时互耦合半导体激光器系统, 研究了互耦合延时和互耦合强度对实时混沌同步质量的影响, 提出了双延时互耦合系统中可将其中一个互耦合延时看作反馈延时的思想, 揭示了多延时互耦合半导体激光器系统实时混沌同步条件和规律.研究结果表明, 多延时互耦合系统中, 某两条双向链路的互耦合延时比值为2, 是实现高品质实时混沌同步的基本条件；增大互耦合强度, 可以改善实时混沌同步品质, 且在较低的等效耦合强度条件下, 双延时互耦合系统较三延时互耦合系统更易于实现良好的实时混沌同步.

安全性是混沌通信中的重要问题。基于一个外光反馈半导体激光器驱动两个互耦合激光器的混沌通信系统，研究激光混沌系统中反馈时延与耦合时延特征, 并应用龙格库塔法进行动态仿真。重点分析了当调节一些可控参数(耦合时延和驱动强度)时，能够改变两耦合激光器输出自相关函数中反馈时延和耦合时延幅值的差异，以此掩藏反馈时延，从而得出更优载波。仿真结果说明利用耦合时延可以增强激光混沌系统的安全性。最后给出了在优化载波后系统同步质量的讨论。

The dynamic behavior of an optical micro ring resonator (OMRR) with an amplitude modulator positioned in the micro ring is investigated quantitatively by adopting a recently introduced quantifier, the permutation entropy (PE). The effects of modulation depth are focused on, and the roles of input power are considered. The two-dimensional (2D) maps of PE showing dependence on both modulation depth and input power are presented as well. PE values nearly increase with modulation depth. On the other hand, the optimal value of input power is achieved when the PE reaches its maximum. Thus, PE can successfully quantify the dynamics of modulated OMRR. Selecting the parameters in the region with high PE values would contribute to the complexity-enhanced OMRR-based chaotic communication systems.